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Theodore H . B a r t h , N e w Y o r k , N . Y . , a s s i g n o r t othe United S t a t e s o f America as r e p r e s e n t e d byt h e S e c r e t a r y o f t h e NavyA p p l i c a t i o n O c t o b e r 1 6 , 1 9 3 9 , ' , S e r i a l N o . 2 9 9 , 7 7 1
( C 1 . 3 5 i - 4 6 . 5 )C l a i m s .1This i n v e n t i o n r e l a t e s i n g e n e r a l t o a i r c r a f t lbomb s i g h t s an d p a r t i c u l a r l y t o attachments t o ,s u c h .An b j e c t o f t h i s i n v e n t i o n i s t o p r o v i d e a ttachments f o r a synchronized bomb s i g h t f o ra i r c r a f t , such a s i s d e s c r i b e d i n my co-pendinga p p l i c a t i o n S e r i a l N o . 1 4 , 9 4 8 , led April 5 , 1 9 3 5 ,t o adapt such bomb sight for low altitude u s e .Another o b j e c t o f t h i s i n v e n t i o n i s t o p r o v i d eattachments f o r a synchronized b o m b s i g h t f o ra i r c r a f t which may e used t o determine the f o r c ean d d i r e c t i o n o f the wind a t an y d e s i r e d a l t i
tude. Another o b j e c t o f t h i s invention i s toprovideattachments f o r a synchronized bomb s i g h t whichu t i l i z e t h e s t a b i l i z i n g f e a t u r e s o f the synchronized s i g h t an d such o f i t s c o n t r o l features a s areadaptable f o r low a l t i t u d e u s e , an d f o r wind d e - . `t e r m i n a t i o n by d r i f t methods.The s y n c h r o n i z i n g f e a t u r e o f t h e s y n c h r o n i z e dbomb s i g h t , d e s c r i b e d i n . my co-pending a p p l ic a t i o n S e r i a l N o . 1 4 , 9 4 8 , f i l e d A p r i l 5 , 1 9 3 5 , an d
2 0 vw h i c h w i l l hereinafter be n o m i n at e d as the par- ent b o m b s i g h t , d o e s not permit i ts u s e a t lowa l t i t u d e s . My > n e w i n v e n t i o n , kn own a s LowA l t i t u d e Bombing A t t a c h m e n t s , a r e a t t a c h a b l et o t h e parent bomb s i g h t t o permit i t s u s e a t lo wa l t i t u d e s . The low a l t i t u d e bombing attachments u t i l i z e certain features o f the parent bomb i g h t ,but not i t s r a t e determination o r c r o s s - t r a i l f e at u r e s , an d s o l v e f o r a dropping range a n g l e f o r 't r a n s i t r e l e a s e o f the bomb a s a function o f theground speed o f t h e a i r c r a f t .As used throughout t h i s s p e c i c a t i o n andc l a i m s t h e r e t o appended, t h e term f r o n t r e f e r st o t h a t s i d e o f the instrument next t o the opera t o r , and back r e f e r s t o t h e o p p o s i t e s i d e t h e r eo f ; r i g h t hand an d l e f t hand r e f e r t o r e l at i v e p o s i t i o n s o f p a r t s o f the instrument a s seenfrom t h e o p e r a t o r s p o s i t i o n .These low a l t i t u d e bombing attachments c o mp r i s e t h e ( l ) p r i n c i p a l a t t a c h m e n t , ( 2 ) t h e - s e co n d a r y o p e r a t i n g c l u t c h , s e c o n d a r y o p e r a t i n gc l u t c h drum, s e c o n d a r y c o n n e c t i n g r o d an d s t ab i l i z e d brush c o l l a r , and ( 3 ) t h e Wedge p r i s m an di t s o p e rati ng mechanism.
35
4 5 . ;The p r i n c i p a l a t t a c h m e n t c o m p r i s e s e s s e n t i a l l ya d j u s t a b l e c a l i b r a t e d elements which make upthe elements o f th e wind, ground s p e e d , a i r speed "t r i a n g l e f a m i l i a l ` i n a e r i a l n a v i g a t i o n , a compasss c a l e , v a r i o u s knobs an d i n d e x e s f o r s e t t i n gc o u r s e s an d s p e e d s , and g e a r i n g between the'
5 0basic triangle and-the compass s c a l e . The sec-o n d a r y o p e r a t i n g c l u t c h , d r u m , s e c o n d a r y c o n - >necting ro d and s t a b i l i z e d brush c o l l a r a r e a f 5 5 p j
moved; . F i g . 3 i s a plan v i e w , p a r t l y i n s e c t i o n through v
2means o f t r a n s f e r r i n g c o n t r o l o f t h e s t a b i l i z e dbrush o f the parent b o m b s i g h t from the s i g h t - ;Thewedge prism i s an o p t i c a l prism which may be f_ i n s e r t e d in the l i n e o f sight of th e telescope ofthe parent b o m b s i g h t a t w i l l i n o r d e r t o bend t h e > .l i n e o f s i g h t f u r t h e r ahead and permit e a r l i e r
t o the azimuth s t a b i l i z e r gyro t h e r e o f .
p i c k i n g up o f t h e t a r g e t i n t h e t e l e s c o p e .Once t h e v e l o c i t y an d d i r e c t i o n o f t h e Wind hasl b e e n s e t , by m eans o f the gearing between th e - .compass s c a l e an d the'basic t r i a n g l e , the ground fspeed of the aircraft can be determined f o r any> 'COuISe. The compass s c a l e can be coupled t othe cardan o f the azimuth s t a b i l i z e r gyro o f the ;:i t o p e r a t e s 4 s i m i l a r l y t o a gyro c o m p a s s .t h e _ r a n g e a n g l e f o r d r o p p i n g bombs v a r i e s w i t hthe ground s p e e d , i f a range a n g l e p r e d i c t i n g s c a l e> p a r e n t b o m b s i g h t a t w i l l , and w hen s o c o u p l e d , '
Since
b e mounted a l o n g s i d e t h e b a r s h o w i n g g r o u n dspeed, the correct angle can be obtained'for an ycourse a s soon a s the n a v i g a t i o n a l problem o fo b t a i n i n g t h e g r o u n d s p e e d h a s b e e n s o l v e d .w ith t h e above an d o t h e r o b j e c t s i n v i e w , t h ei n a f t e r more f u l l y d e s c r i b e d .Reference i s t o be'had t o the accompanyingdrawings forming a p a r t o f t h i s s p e ci f i c a t i o n i n
l i n v e n t i o n . c o n s i s t s i n t h e c o n s t r u c t i o n , c o m b i - _ _' n a t i o n and arra n gemen t of parts as w i l l be here-
,which l i k e reference 'characters indicate corre- s p o n d i n g p a r t s t h r o u g h o u t t h e s e v e r a l v i e w s a n d ' , V Iin which: 1F i g . 1 i s a plan view showing t h e p r i n c i p a l . ' `attachment, t h e secondary o p e r a t i n g c l u t c h , t h ey . s e c o n d a r y c o n n e c t i n g rod and t h e s t a b i l i z e d brush l c o l l a r mounted i n p l a c e on t h e azimuth s t a b i l i z e rg y r o housing o f t h e p a r e n t bomb s i g h t ;F i g . 2 i s a plan view o f t h e parent bomb s i g hs i g h t member r e ith the upper c a s i n g o f the
3-3 o f F i g . 4 , o f t h e upper c a s i n g m e m b e r o fh e azimuth s t a b i l i z e r g y r o o f t h e parent bomb".s i g h t , showing themethod o f attachment o f _ t h e "secondary operating c l u t c h , the secondary con- f *n e c t i n g r o d an d t h e s t a b i l i z e d brush c o l l a r ;F i g . 4 i s a s e c t i o n a l v i e w t h r o u g h 4-4 o f F i g . 3 ; , F i g . 5 i s a t h r e e - q u a r t e r Y bottom plan v i e w of ithe s i g h t member f the parent bomb i g h t t a k e n Afromthe back; . ' ' "F i g . 6 i s a three-quarter rear view o f the sight "member of ' t h e parent bomb s i g h t taken froma b o v e , showing the method o f attachment o f t h e ' y -wedge p r i s m an d i t s o p e r a t i n g mechanism;Fig. 7 isa'side view o f the telescope o f the par- i .
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2 , 5 1 6 , 2 9 03e n t bomb s i g h t , assembled i n the s u p p o r t i n gc r a d l e t h e r e f o r ;F i g . 8 i s a c r o s s - s e c t i o n a l view through 8--8_ o f F i g . 2 , l o o k i n g from r i g h t t o l e f t , showing t h ewedge prism i n t h e l i n e o f s i g h t o f t h e t e l e s c o p e ;F i g . 9 f i s a c r o s s - s e c t i o n a l View through 9-9o f F i g . 1 , l o o k i n g from f r o n t t o r e a r ;F i g . l 0 is a c r o s s f s e c t i o n a l v i e w through I l l - . I 0o f F i g . l , l o o k i n g f r o m - l e f t t o r i g h t ;F i g . 1 1 i s a s e c t i o n a l view through Il-II o fF i g . l , l o o k i n g from f r o n t t o r e a r ;F i g . 1 2 i s a s e c t i o n a l view through I 2 - - I 2 o fF i g . l , l o o k i n g from f r o n t t o r e a r ;F i g . 1 3 i s a plan View o f t h e d r i f t a n g l e s c a l e ,partly i n s e c t i o n t o sh o w t h e ` construction o f t h eT - b a r , movable d r i f t i n d i c a t o r s and r o l l e r s ;F i g . 1 4 i s an enlarged sectionalviewthroughI4-I4 o f F i g . l , l o o k i n g from l e f t t o r i g h t ; an dF i g . 1 5 i s v a n e n l a r g e d s e c t i o n a l View t h r o u g h II5-I5 o f F i g . 1 , l o o k i n g from l e f t t o r i g h t .Thesynchronized bomb s i g h t d e s c r i b e d i n z m y ;co-pending application S e n i a l , N o . - _ 1 4 , 9 4 8 , i s A _ n o t _s u i t a b l e . f o r low a l t i t u d e , . u s e f o r . t h e f f o l l o w i n g g .r e a s o n : Aticw a l t i t u d e s . t h e , droppi ngrangea n g - l e s . ; a r e l a r g e . . f r e q u e n t l y . o f p t h e . , o r d e r ; _ o f 1 = . 5 0 _ .degrees.` S in ce the problem must be entirelys o l v e d - . b e f o r e the dropping` range angleis reached,a t low a l t i t u d e s .theanglethrough . w h i c h p t h et a r g e t may b e f o l l o w e d b e f o r e r e l e a s e o f t h e bombi s c - m u c h . l e s s than a t h i g h . _ a l t i t n d e s . _ _ _ F u r t h e r . .t h e a - a t e o f . c h a n g e o i . range n g l e , s much r e a t e r ,a t _ _ . l o ; w . Laltitudes _ The result > i s that; the . ti m ef o r - s y n c h r o n l i z a t i o n i s g r e a t l y _ r e d u c e d a t p l o w
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42 2 i s s t a b i l i z e d i n azimuth by the s t a b i l i z e r gyroI t ' , a c t i n g through the mechanism a s shown.Referring t o F i g . 5 , s t a b i l i z e d s e c t o r 2 2 i s r o t a ta b l e on the enlarged upper portion o f s p i n d l e 2 4an d i s held i n p o s i t i o n between f l a n g e 2 5 an d ab e a r i n g s t r i p ( n o t shown) t h a t l i e s a g a i n s t t h ebottom o f s i g h t c a s i n g m em b er 2 l . S p i n d l e 2 4i s r o t a t a b l y mounted ina s l e e v e 2 0 (Figyl) s ecured ' i n ' the azimuth s t a b i l i z e r g y r o l c a s i n g 3 0bya screw 3 ! an d having a shoulder 3 2 u p o nwh ich seats shoulder 33 ( F i g . 5 ) o n spindle 2 4 .K A p i l o t directorqbrush 3 4 ( F i g s . 3 an d 4 ) i sdisposed t o move in contact with a commutator3 5 ` w i t h i t s t i p S B L a d j a c e n t t o s c a l e 3 l , t h u s i n d iv j c a t i n g , t h e d e v - i a t i o n o f t h e brush 3 4 from t h e f o r eand af t d irecti o n of the a i r c r a f t . Brush 3 4 i smountedzOIi-anarm that i s secured t o memb e r 3 9 i n f r i c t i o n a l engagement with s l e e v e 4 0 ,i n t e g r a l with gear 4 I , but w hen brush 3 4 cont a c t s a l i m i t stop ( n o t . r s h o w n ) a t e i t h e r endo f commutator.35,.zmemberi 9 ' t v i - l l ~ s l i p . on s l e e v e4 0 . 1 : A wormgear. 4 2 . 1 . , ( F g n 5 ) ' . 1 m e s h e s . w i t h gear4 I ( F i g . 4 ) an d i s d r i v e n by means o f g e a r s f i n ' r .h o u s i n g s v 4 3 1 . _ a n d ' l i f i r t h e A g e a r i n g t h e c l a t t e r f h o u s .c l o s e s f s h a t 4 % . . . a n d , h a s . . a r . k n o b _ 4 1 . o n i - i t s ; o u t e r . " `e n d , s h a f t . 4 5 . b e i n g ; j o u r n a l e d i n w a a b r a c k e t j oc a r r i e d : b y s i g h t c e a s i n g , - 4 9 1 i n ; a :mannen o g c p r e a lve nt y.longitudinal 'movement . o f _ :shaft 145m, By
agfimeans of knob. 41;.andipartsconnectedthereto. . .
a l t i t u d e s an d i s . t o o s h o r t ' t o _ e i e c t i v e l y s o l v e t h ep r o b l e m . I n a d d i t i o n , t h e a v a i l a b l e a n g l e s b e :t w e _ e _ r i _ _ p i c k i n g = _ . l 1 p t h e ; t a r g e t an d r e l e a s e q o f . t h ebomb a t low a l t i t u d e s a r e ` unfavorableforan
gear 4 . v m a y l : b e : rotated t o u n o v e - l o r u s h : 4 . ' . . < F i g ; . 4 ) _ .o v e r . , x c ommu tator 3 5 . 1 . Worm: 4 2 ~and Yassociated :members form t h e c o n n e c t i o n between g e a r s - 4 I . ;an d t h e _ s i g h t V c a s i n g 1 4 9 . 1 s u c h 1 t h a t ; when t h e . s i g h t' leasing t e ; isrotated-:about i t s . . _ v e r t i c a l g : _ a x i s c g e a r f .3 5
a c c u r a t e s o l u t i o n w i t h r v t h e s y n c h r o n i z e d s i g h t . ,s i n c e a t s u c h o b l i q u e a n g l e s a r e l a t i v e l y l a r g e a i rcraft travel i s required f o r a .small _change ofa n g l e . ' V
4 I r o t a t e s . w i t h i t a n d w i l l ; i n . t u r n , : . c a u s e . . m o v e f . ~ment o f brush _ 3 4 " . . o v e r z c o m m 1 . i t a t 0 r ; _ ' 3 5 . .Whenrtknob 5 0 ` ( F i g . 5) i s turned..` shaft. ' 4 6 and a awotmi n c a s i n g 5 2 r o t a t e w i t h f - s i t , . t h e f w o r r n m e s b i n g z fmswith t e e t h 5 3 ' . machined. i n * ` t h e r s t a b i l i z e d x s e c t o r
The parent b o m b s i g h t can b e . used for a l t i ;t u d e s a b o v e 1 , 7 0 0 f e e t , ` b u t i t s a d a p t a b i l i t y , d ec r e a s e s with a l t i t u d e wh e n t A isemployed a t . a l t i ft u d e s _ b e l o w 3 , 0 0 0 f e e t . The l o w a l t i t u d e a t t a c h ements a r e u s e f u l up t o _ 3 , 0 0 0 f e e t , ` but a r e A e s p e , - Ac i a l l y d e s i g n e d f o r o b t a i n i n g d r o p p i n g r a n g eanglesbetween a l t i tu d e s o f _ f r o m 7 0 0 t o _ 1 , 7 0 0 ' f e e t .I m m e d i a t e l y f o l l o w i n g _ i s a b r i e f d e s c r i p t i o n o fc e r t a i n f e a t u r e s o f t h e p a r e n t bomb s i g h t ' w h i ' c h a r e employed i n c o n n e c t i o n - w i t h t h e operation
4 5
of th e V l o w a l t i t u d e b o m b i n g attachments: yA >more complete d e s c r i p t i o n o f t h e s e f e a t u r e s o ft h e parent b o m b s i g h t i s g i v e n i n my ' c o - ' p e n d i n ga p p l i c a t i o n f o r ` t h e p a r e n t V b o m b s i g h t .R e f e r r i n g t o F i g . 1 1 , t h e cardan I 8 ofthe a z i - lmuth stabilizergyro ( n o t ' shown) of thelparent .b o m b - s i g h t p r o j e c t s v e r t i c a l l y f u p w a r d t h r o u g hthe l u p p e r s t a b i l i z e r g y r o c a s i n g A I 1 . ~ The a x i s i o ft h e azimuth s t a b i l i z e r g y r o I 6 ( F i g . 9 ) isssub-H-oamembers 2 l an d 4 9 f o r ~ z o v e r c o r r e c t i o n i n r o r d e r i rs t a n t i a l l y h o r i z o n t a l and,~When the - r o t o r o f t h i s
5 5 1 1 - 1
gyro i s i s p i n n i n g , tends t o - . p o i n t 4 . t o . _ t h e samendirection in space.i s t h u s s t a b i l i z e d i n azimuth. D i r e c t i o n a l oper
The .cardan 6 Ii s .attachedtoandcontrolled--by the s t a b i l i z e r - g y r o Y I 6 ' . an d fating c l u t c h ` drum I 8 has ` a a s l i d i n g . t a p e n f t .a r o u n d - f t h e v .upper end o f cardan I 6 .and . i s heldi m p l a c e . t h e r e o n by-nut I 8 ' . D i r e c t i o n a l o p e ra t i n g . . c l u t c h ring . I 9 _ c l a m p s . l a r o u n d ~ v r _ d r u m . I 8 7 0 . , a s s t a b l a v e r t i c a l , f o r : . t h e . s i g h t _ . t e l e s c o p e r i - _ t h a t i lwhen t h e c l u t c h i s engaged by o p e r a t i n g h a n d l e .2 0 , ; ( F i g . . . 3 ) . R e f e r r i n g t o F i g . 3 , radialextens i o n , . . 2 I from . t h e d i r e c t i o n a l i o p e r a t i n g c l u t c hr i n g - I 9 i s .connectedtostabilized sector 22 b y a .r i g i d l i n k; 2 3 . Thus, when-the . d i r e c t i o n a l o p e ra t i o n c l u t c h I 9 _ ' : i s e n g a g e m f t h e . s t a b i l i z e d s e c t o r A 7 5
2 2 . n T h e s t a b i l i z e d s e c t o r z Z Z i b e i n g h e l d s t a b i l i z e d . i n azimuth by t h e s t a b i l i z e r . gyro w h e n . d i r e c t i o n a l ; operating c l u t c h . I 9 . 7 : ; i s . r engaged; t h i s s _ r o t a t i o n of:theworm-in c a s i n g , 5 2 ~ . r o t a t e s s i g h t c a s i n g 2 ' I _ ; ; a n d _ ~ `. _ . w i t h 1 i t ' w o r m 4 2 3 c a s i n g . 4 9 ' , b r a c k e t . ; 4 8 , ; s h a f t s .4 5 ' an d 4 6 ; . a b o u t a v e r t i c a l a x i s :through spindlae2 4 ' , L w o r m c a s i n g . . ; 5 2 , ; b e i n g _ ,attached t o f sight c a s - . _ `i n g . . 2 1 : 1 T h i s ` movement. o f worm . . 4 2 r r o t a t e s a z g c a r g ;4 1 : , thereby . c a u s i n g . b r u s h 3 4 . - * : t o 1 - v r o t a t e f a t a t h e . :same. rate o ' vmovement asithe i g h t ; w i t h i n a ' t h e 1 il i m i t s o f itspossiblemovement. .Movement o i n - 1 'brush.34 . o v e r zcommutator 3 5 l r 3 ` s . o o n ' i r n u n i c a t e d . - : , Ye l e c t r i c a l l y t o cause t h e . . n e e d l e z . ( n o t s h o w n i i . ; 0 fa . . p i l o t d i r e c t o r . i n d i c a t o r . _ ( n o t z x s h o t v n ' l . : i n t h ep i l o t s ` c o c k p i t t o r i n d i c a t e i t o . t h e = . p i l o t \ ; . w h e n . a b e ri s o f i ~ the . p r o p e r v c o u r s e a n d l w h e t h e r r h e f f i s 0 1 T . t o n sthe . r i g h t orleft. i When.,knobsr 41oand750. are cturned : s i m u l t a n e o u s l y v a t . t h e i s a m e m t i i n e . . brush _ 134.11noves . 5 . 2 . 5 . t i m e s as . f a s t _assthe sight casingt o .bringthe a i r c r a f t m ore u i c k l y - , s t o t h e p r o p e rcourse.
R e f e r r i n g t o F i g s . 2 ; ; 7 a n d c . 4 p i v o t e - i l y ~ mountedn a n t i -f r i c t i o n _ b e a r i n g s a t t h e r e n d s ' . o f t h e : l o w e r ; ; s i g h t c a s i n g ` f i n e n i b e r ' 2 1 i s _thenormallyathwart-s h i p cardan 5 4 , i n one endcof.which'fismountedt h e > s i g h t s t a b i l i z i n g g y r 0 l 5 5 = ~ 1 u p o n - t r u m i i o n s . . 5 5 t h a t l i e - a t r i g h t i a n g l e s t o g t h e n c a r d a n b e _ a r i n g s _ ; . , _t h e ` s p i n - a x i s g o f g y r o = n b e i n g f y v e r t i c a l . t o r p l o v i d e fi s _ a l s o vmounted i n i cardan Upon t h e . u p p e r i s u r f a c e ofthe c a s i n g . o f gyro 5 5 . - . a r e l f o r e - . a n d e a f t - " 3 rl e v e l 5 8 r a n d a t h w a r t s h i p z ~ l e v e l f 5 9 , m o v a b l e a w e i g h t si l - . a n d 6 I . . f o r ` s t a t i c a l l y _ b a l a n c i n g a g y r o . 5 5 ; i x a n d ov a f o r w a r d l y a n d u p w a r d l y i n c l i n e d r p i n 6 , 2 . - a d a p t e d n
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2 . 5 1 . 6 , 2 9 0t o - b e . engaged by a longslidable s l e e v e ( n o t `shown) t o which l o c k i n g knob 6 , 4 ( F i g . 6 ) i s A a t * lt a c h e d , t o l o c k g y r o 5 5 K a g a i n s t movement , w h e nnot i n u s e . Knobs 6 5 an d 6 6 a r e s l i d a b l e towardand away from c a s i n g m e m b e r 2 1 an d are co nnectedto f r i c t i o n r o l l e r s ( n o t shown) w h i c h ,when t h e knobs a r e p u s h e d y i n an d r o t a t e d , w i l lt i l t r g y r o 5 5 a t h w a r t s h i p s an d f o r e f a n d - a f t , r es p e c ti v e l y , t o l e v e l t h e g y r o . W i n d o w 6 1 ( F i g . 5 )i s p r o v i d e d a d j a c e n t t h e e x i t l e n s o f t h e s i g h tt e l e s c o p e 5 6 t o permit an unobstructed l i n e o fs i g h t V f r o m t h e t e l e s c o p e t o t h e t a r g e t f o r an yp o s i t i o n o f t h e t e l e s c o p e w i t h i n i t s range o fmovement. T e l e s c o p e 5 6 i s r o t a t a b l e i n b e a ri n g s 6 8 ( F i g . 7 ) c a r r i e d by c r a d l e 6 9 t h a t i smounted on t r u n n i o n s 1 0 ( F i g . 2 ) _ c a r r i e d by c a rdan j 4 , w h e r e b y c r a d l e 6 9 , c a r r y i n g t h e t e l e s c o p e ,may r o c k a t h w a r t s h i p s , an d t e l e s c o p e 5 6 maybe r o t a t e d i n a fore-and-aft plane independentlyo f s t a b i l i z e d cardan 5 4 . The a n g u l a r p o s i t i o n o ft e l e s c o p e 5 6 w i t h r e s p e c t t o t h e v e r t i c a l i n af o r e - v a n d - a f t ' p l a n e i s i n d i c a t e d o n c a l i b r a t e ds c a l e 1 | o p p o s i t e i n d e x mark 1 2 a t t h e o c u l a rend o f the t e l e s c o p e . T e l e s c o p e 5 6 has both ahorizontal an d a v e r t i c a l c r o s s mark a t r i g h tangles t o each other etched o n a l e n s t h e r e i n .Telescope 5 6 i s m o v e d i n a fore-and-aft planeby displacement knob 1 3 ( F i g . 6 ) which has anger knob 1 4 thereon f o r r a p i d e r e c t i o n o f t h et e l e s c o p e . C r a d l e 6 9 c a r r y i n g t e l e s c o p e 5 6 maybe r o c k e d a t h w a r t s h i p s by movement o f athwarts h i p s l e v e l i n g knob 6 5 ( F i g . 2 ) .Referring t o F i g s . l and 3 , a s c a l e 1 5 , c a l ibrated i n d e g r e e s t o the r i g h t and l e f t o f a cent r a l z e r o mark, i s secured t o casing 1 6 over thes t a b i l i z e d brush mechanism. T h i s s c a l e 1 5 i sp o s i t i o n e d athwartships such that a l i n e p a r a l l e lt o the l o n g i t u d i n a l a x i s o f the a i r c r a f t p a s s e sthrough i t s mid-zero mark. A _ n index ( n o tshown) a t t a c h e d t o s i g h t c a s i n g 2 1 , i n d i c a t e st h e a n g u l a r d i s p l a c e m e n t o f t h e s i g h t v t o t h er i g h t o r l e f t o f the l o n g i t u d i n a l a x i s o f the a i rc r a f t .The f o r e g o i n g d e s c r i p t i o n r e f e r s t o c e r t a i n f e at u r e s o f the parent b o m b s i g h t which a r e emp l o y e d i n c o n n e c t i o n w i t h t h e o p e r a t i o n o f t h elow a l t i t u d e bombing a t t a c h m e n t s . The low a l t i ~tude bombing attachments t h e m s e l v e s a r e d es c r i b e d i n t h e f o l l o w i n g p a r a g r a p h s :
. Referring t o F i g s . 9 an d 1 1 , secondary v o p e ra t i n g c l u t c h dru m 1 8 i s attached t o t h e web 1 9o f d i r e c t i o n a l o p e r a t i n g c l u t c h drum I 8 . S e co n d a r y o p e r a t i n g c l u t c h r i n g 8 0 c l a m p s arounddrum 1 8 when t h e s e c o n d a r y o p e r a t i n g c l u t c h8 0 i s engaged. A compass s c a l e comprising ac i r c u l a r metal supporting p l a t e 8 2 an d a thin supp o r t e d d i s c 8 3 , t h e l a t t e r > c a l i b r a t e d i n d e g r e e sfrom 0 t o 3 5 , 9 , r e s t s on t h e t o p o f drum I 8 , witha n i n t e g r a l p e r p e n d i c u l a r l y e x t e n d i n g c y l i n d r i c a lp r o j e c t i o n 8 4 from p l a t e 8 2 a smooth s l i d a b l ef i t i n s i d e drum I 9 . A s l e e v e 8 5 , threaded ext e r n a l l y a t i t s upper end and with an i n t e g r a l >r a d i a l l y extending f i a n g e 8 0 near i t s lower e n d ,' . f i t s i n a c e n t r a l hole in compass s c a l e 8 | , withf l a n g e 8 6 r e s t i n g on the t o p o f compass s c a l e 8 |an d attached t h e r e t o by s c r e w s . Wind ear 8 1 hasa c e n t r a l c i r c u l a r opening which f i t s around theunthreaded p o r t i o n o f s l e e v e 8 5 a b o v e f l a n g e 8 6 .An annular member B o f hard rubber i s a press t in a c i r c u l a r groove in th e lower face o f w i n dgear 8 1 an d bears o n the top o f compass s c a l e8| when t h e wind g e a r i s clamped a g a i n s t t h ecompass s c a l e B i . W i n d g e a r 8 1 has the headan d t a i l o f anarrow, 1 8 0 d e g r e e s a p a r t , engravedonits upper f a c e near i t s p e r i p h e r y a s an index
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6t o s e t w i n d d i r e c t i o n . A n n u l a r m o v a b l e s c a l e ? >9 0 i s a s l i d i n g f i t i n a d e p r e s s i o n > i n the upperf a c e o f wind gear 8 1 an d i s h e l d i n p l a c e by d i s c8 9 , s e c u r e d t o wind g e a r 8 1 . Rounded-toppedp i n s 9 | a r e p r o v i d e d t o r o t a t e movable s c a l e 9 0 by hand. Movable s c a l e 9 0 i s c a l i b r a t e d i n ` 1 0degree increments o v e r 1 6 0 d e g r e e s o f a r c , 0 t o80 degrees o n each s i d e o f a mid-zero mark. Aknob 9 2 , t h r e a d e d i n t e r n a l l y , c l a m p s wind g e a r8 1 a g a i n s t compass s c a l e 8 | w hen screwed d o w naround s l e e v e 8 5 . A houlder 9 3 o f coupling knob9 4 bears a g a i n s t the upper end o f s l e e v e 8 5 a srod 9 5 , threaded a t i t s l o w e r end an d i n t e g r a lw i t h knob 9 4 , i s s c r e w e d i n t o a t h r e a d e d h o l ei n the upper end o f s t a b i l i z e r gyro cardan I 6 ,clamping compass s c a l e 8 | t o drum I 8 .Mounting b r a c k e t 9 6 i s s e c u r e d t o t h e t o p o fg y r o h o u s i n g I 1 an d s u p p o r t s b a s e p l a t e 9 6 .Base p l a t e 9 6 i n t u r n s u p p o r t s t h e e l e m e n t s o ft h e w i n d , g r o u n d s p e e d , a i r s p e e d t r i a n g l e , k t h ei d l e r p i n i o n 9 ' ! an d xed i n d i c a t o r 9 8 . R e f e r r i n gt o F i g s . 1 0 an d l l , f i x e d a i r speed arm 9 9 comp r i s e s a p a i r o f i n v e r t e d L-shaped b a r s | 0 0mounted upon an d d i r e c t l y secured t o base p l a t e9 6 ' , with a s c a l e | 0 | , c a l i b r a t e d i n a i r s p e e d , s ecured t o the to p o f each bar | 0 0 . Ai r speed i nd i c a t o r bar | 0 2 i s a smooth, s l i d i n g t betweent h e two i n v e r t e d L-shaped b a r s o f t h e a i r s p e e darm 9 9 , an d may be m o v e d back an d forth i n ad i r e c t i o n p a r a l l e l t o t h e l o n g i t u d i n a l a x i s o f L - yshaped b a r s | 0 0 a s n e c e s s a r y . I n t e g r a l w i t h a i rspeed i n d i c a t o r bar | 0 2 ( F i g . 1 0 ) i s a s h o r t p e r - p e n d i c u l a r c y l i n d r i c a l e x t e n s i o n | 0 3 , d r i l l e d a n d >t h r e a d e d i n t e r n a l l y t o r e c e i v e a i r s p e e d l o c k i n g 's c r e w | 0 4 . Knob | 0 5 i s f a b r i c a t e d i n t e g r a l w i t h 'a i r speed l o c k i n g s c r e w . When screwed d o w n , >t h e l o w e r end o f l o c k i n g s c r e w | 0 4 b e a r s a g a i n s ta b l o c k | 0 5 ' o f hard rubber which t s i n a g r o o v e , vi n t h e l o w e r f a c e o f a i r s p e e d i n d i c a t o r bar | 0 2 .
l A e l i c a l spring | 0 6 nt s around locking screw | 0 4 1 .under knob | 0 5 and b e a r s a g a i n s t a washer | 0 1 vwhich e n c i r c l e s t h e upper reduced diameter p o r - t i o n o f c y l i n d r i c a l e x t e n s i o n | 0 4 an d r e s t s uponmovable ground speed arm | 0 0 . Index | 0 9 i s s ecured by a screw and a p a i r o f c e n t e r i n g p i n s t o >a i r speed indicator b ar | 0 2 . o f a i r speed i n d i c a t o r bar | 0 2 i s a t t a c h e d a r cshaped . b l o c k | | 0 ( F i g s . 1 0 an d 1 4 ) on t o p o f vwhich a r c - s h a p e d d r i f t a n g l e s c a l e | | | ( F i g . l " Ti s s e c u r e d , an d i n t h e upper f a c e o f which ismal"chined a l o n g i t u d i n a l s l o t | l 2 wherein s l i d e m o v - n 'a b l e d r i f t a n g l e i n d i c a t o r s | | 3 an d H4.r Thelower h o r i z o n t a l p o r t i o n o f an arc-shaped I - b a r| | 5 i s a t i g h t nt i n the lower c e n t r a l p o r t i o n o fl o n g i t u d i n a l s l o t | I 2 .
a T-shaped s l i d e r | | 8 with a bent p o i n t e r | | 9 a t a :tached t h e r e t o on t h e t o p o f t h e T , p o i n t e r | | 9b e i n g d i s p o s e d a d j a c e n t t o s c a l e l l l . Movabled r i f t i n d i c a t o r | | 4 i s shaped t o s l i d e under t h e 4bent p o i n t e r H9 o f d r i f t i n d i c a t o r | I3 and hasan index mark i n s c r i b e d thereon a d j a c e n t . t os c a l e Hl. Ground speed arm | 0 8 has a lo ng i t u d i n a l t h r o u g h s l o t | 2 0 ( F i g . v 1 ) > a l o n g t h eg r e a t er p o r t i o n o f i t s l e n g t h . The s l o t t e d l e n g t h ,o f ground speed arm | 0 8 i s widened, an d where` t h e width narrows near i t s f r o n t e n d , groundspeed arm | 0 8 i s d r i l l e d f o r a sm o o th rotating f l taround the upper reduced diameter p o r t i o n o f _ t h ec y l i n d r i c a l e x t e n s i o n | 0 3 ` from a i r s p e e d i n d i - c a t o r b a r v E0 2 ( F i g . l 0 ) . D r i f t a n g l e p o i n t e r | 2 | i s s e c u r e d b y a s c r e w a n d a p a i r o f 4 . c e l ' i t e l l i r u l l g , v .
At t h e f r o n t e n d ' >
P l a t e s | | 1 are secured tomovable d r i f t i n d i c a t o r s | | 3 an d | | l 4 by p i n s | | 6 , a r e a s l i d i n g r l t between t h e h o r i z o n t a l webs o f ;I - b a r H5 , an d h o l d t h e movable d r i f t i n d i c a t o r s - 'i n p l a c e . Movable d r i f t i n d i c a t o r H3 c o m p r i s e s A
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2 , 5 1 6 , 2 9 0a s an open s i g h t f o r preliminary work with ' t h ebomb s i g h t .
O p e r a t i o n f o r l o w a l t i t u d e bombingIn t h e o p e r a t i o n o f t h i s d e v i c e f o r bombing,t r a n s i t r e l e a s e o f bombs, which i s t h e methodo r d i n a r i l y e m p l o y e d , r e q u i r e s t h a t t h e t e l e s c o p e5 6 be s e t t o the proper dropping range a n g l e f o rt h e c o r r e c t a l t i t u d e , ground s p e e d , i n d i c a t e d a i rspeed and t y p e o f bomb b e i n g u s e d . The dropp i n g range a n g l e v a r i e s w i t h t h e ground s p e e d f o ran y 4 g i v e n a l t i t u d e , a i r s p e e d an d t y p e o f bomb.The low a l t i t u d e bombing attachments p e r m i t t h ed e t e r m i n a t i o n o f t h e dropping range a n g l e a f t e rt h e t r u e wind a t t h e bombing a l t i t u d e i s knownand has been s e t i n the mechanism. The t r u ewi nd can be obtained from a s t r o l o g i c a l observat i o n s , n a v i g a t i o n a l f a c i l i t i e s , o r by u s i n g t h e a ttachments f o r f i n d i n g the wi nd i n th e ma n n erl a t e r d e s c r i b e d h e r e i n . A f t e r t h e t r u e wind a tt h e bombing a l t i t u d e has been s e t i n t o t h e m e c ha n i s m , t h e attachments w i l l i n d i c a t e t h e groundspeed f o r an y t r u e c o u r s e t h a t t h e a i r c r a f t i ss t e e r i n g .' I h e normal sequence o f o p e r a t i o n s i n usingt h e s e attachments f o r low a l t i t u d e bombing i s a sf o l l o w s , assuming t h e wind f o r c e and d i r e c t i o n a tt h e bombing a l t i t u d e known: E n e r g i z e t h e e l e ct r i c a l c i r c u i t s o f t h e s i g h t s t a b i l i z i n g g y r o 5 5 t h eazimuth s t a b i l i z e r gyro I6 ' and the p i l o t d i r e c t i o ni n d i c a t o r `mechanism o f t h e parent bomb s i g h t .
Make sure the t r a i l arm s s e t on zero an d thatt h e t e l e s c o p e r a t e motor i s n o t s t a r t e d , a s t h e s ed e v i c e s o f th e parent b o m b s i g h t v a r e not usedi n c o n n e c t i o n w i t h t he l o w a l t i t u d e bombing a ttachments. Attach t h e proper range a n g l e s c a l e[ 2 3 i n _ p l a c e on ground speed arm U 8 ( F i g . ' 1 ) .S e t t h e known wind d i r e c t i o n a t t h e bombing a l t itude by p l a c i n g the t a i l o f the arrow on the ` w i n dgear 8 1 opposite the proper degree mark on comp a s s , s c a l e 8 l . `Lock wind gear ` 8 ' ! t o compasss c a l e 8 l by c o u p l i n g knob 9 2 . S e t t h e knownwind f o r c e by s l i d i n g wind b a r | 3 0 u n t i l i n d e xI 3 i i s o p p o s i t e t t h e proper graduation on windarm 2 ? . Lock wind bar | 3 0 t o wind d i s c 5 2 5 bywind bar l o c k knob I 3 4 . S e t t e l e s c o p e 5 f a t i t smaximum orward a n g l e . l S l i d e t h e wedge prisml 5 ? i n t h e l i n e o f s i g h t o f t e l e s c o p e 5 , 6 t o - g i v eg r e a t e r forward v i s i o n . T h e t a r g e t 1 c a n now bep i c k e d up i n t h e t e l e s c o p e when i t i s 8 0 d e g r e e sforward o f t h e v e r t i c a l . Engagement o f wedgeprism 5 1 may be d e f e r r e d i f i t i s d e s i r e d t o us eknob I 6 @ a s an open s i g h t . Se t i n d i c a t e d a i rs p e e d by s l i d i n g a i r s p e e d i n d i c a t o r b a r m2 u n t i lindex I O S i s o p p o s i t e the proper graduation ons c a l e s l i l I . The attachments have been d e s i g n e dt o compensate f o r t h e normal d i f f e r e n t i a l betweeni n d i c a t e d a i r s p e e d s and t r u e a i r s p e e d s a t t h ev a r i o u s a l t i t u d e s . A f t e r t h e t a r g e t i s s i g h t e d , d ir e c t t h e p i l o t t o head toward i t . Center t h e s t ab i l i z e d s e c t o r 2 2 by matching p o i n t e r 3 6 w i t h t h ez e r o mark on s c a l e 3 l ( F i g . l ) . E n gage the d ir e c t i o n a l o p e r a t i n g c l u t c h I 9 a r o u n d drum l 8This c o u p l e s t h e parent bomb s i g h t t o t h e s t a b il i z e r gyro cardan i t and s t a b i l i z e s the parent b o m bs i g h t i n a z i m u t h . S e t t h e t r u e heading o f t h ea i r c r a f t on compass s c a l e t l o p p o s i t e movablel u b b e r s l i n e H i ! ( F i g . l ) , an d c o u p l e t h e compasss c a l e 8 l t o t h e s t a b i l i z e r cardan I6 by means o fc o u p l i n g knob S e ( F i g . 1 l ) . Unlock t h e s i g h ts t a b i l i z i n g g y r o 5 5 by r e l e a s i n g l o c k i n g knob B f twhich d i s e n g a g e s s l e e v e from l o c k i n g p i n 6 2 . S e tt h e s i g h t s t a b i l i z i n g g y r o 5 5 t o t h e v e r t i c a l byc e n t e r i n g b u b b l e s i n l e v e l s 5 3 an d 5 9 ( F i g . 2 ) byt h e useof knobs y 6 5 an d 6 6 . D i r e c t t h e p i l o t t o
3 5
10t h e c o l l i s i o n c o u r s e , by moving knobs 4 1 an d 5 Ut o g e t h e r i n t h e same d i r e c t i o n u n t i l t h e etchedc r o s s marks i n the s i g h t t e l e s c o p e s t a y on thet a r g e t . This m o vem en t o f both knobs 4 1 an d 5 0d i r e c t s the s i g h t on the t a r g e t and s e t s a d r i f ta n g l e . Each time e i t h e r knob ( i l o r 5 t i s r o t a t e d ,s t a b i l i z e d brush 3 / 5 i s moved o v e r commutator 3 5 ,t h u s c a u s i n g t h e p i l o t d i r e c t o r i n d i c a t o r n e e d l e o ft h e p i l o t d i r e c t i o n i n d i c a t o r i n t h e p i l o t s c o c k p i t t o move,thus indicating t o the p i l o t that achange o f c o u r s e i s necessary i n order t o againcenter the n e e d l e . When on the bombi ng c o u r s e ,o b t a i n c o r r e c t dropping range a n g l e o p p o s i t e i ndex 4 3 2 on range angle s c a l e 2 3 . Rotate d i sp l a c e m e n t knob 1 3 ( F i g . 6 ) v moving t e l e s c o p e 5 Bi n a f o r e and a i t plane u n t i l index ' I 2 i s o p p o s i t et h e proper dropping range angle on s c a l e ' I l i ns i d e t h e s i g h t . S l i d e t h e wedge prism l 5 ? ( F i g s .6 an d 8 ) out o f the l i n e o f s i g h t wh e n the t a r g e tpasses below the athwartships c r o s s mark i n thet e l e s c o p e 5 1 6 . Target ` w i l l then be v i s i b l e i n t h eupper p a r t o f t h e f i e l d o f t h e t e l e s c o p e above t h ea t h w a r t s h i p s c r o s s l i n e , s i n c e t h e t e l e s c o p e hasa f i e l d o f 2 0 d e g r e e s . R e l e a s e t h e bomb manuallywhen the t a r g e t c r o s s e s t h e athwartships c r o s smark f the telescope.I t w i l l b e n o t e d t h a t when bombing i t i s o n l yn e c e s s a r y t o bring t h e a i r c r a f t t o a c o l l i s i o nc o u r s e with t h e t a r g e t , obtain the range a n g l efrom t h e a t t a c h m e n t s , s e t t h e s i g h t t e l e s c o p e ` t ot h i s a n g l e an d r e l e a s e t h e bomb when t h e t e l e #scope h o r i z o n t a l c r o s s mark c r o s s e s the t a r g e t .The aircraft can be brought to an approximatec o l l i s i o n c o u r s e by u s e o f t h e open s i g h t , an d t oan a c c u r a t e l c o l l i s i o n c o u r s e a f t e r t h e t a r g e t canb e p i c k e d up i n t h e t e l e s c o p e . The r a n g e a n g l eobtained o p p o s i t e index | 3 2 ' on c a l e 2 3 i s c o rr e c t f o r that c o l l i s i o n c o u r s e and a l t i t u d e . I f asubse que nt cha n g e of target course or spe e d oc
40 c u r s , or i f a subsequent change o f the a i r c r a f tc o u r s e o r speed i s necessary f o r any r e a s o n , i t i sonly necessary t o bring the a i r c r a f t t o a n e wc o l l i s i o n c o u r s e , read t h e n ew range a n g l e , an dr e - s e t t h e t e l e s c o p e .I t i s e a s i l y p o s s i b l e t o r e a c h a ' c o l l i s i o n c o u r s ew i t h t h e t a r g e t d u r i n g t h e i n t e r v a l between t h et i m e ` w h e n t h e t a r g e t i s s i g h t e d an d t h e d r o p p i n grange a n g l e i s r e a c h e d , even a t very low a l t i t u d e s iIn a d d i t i o n , i t i s n e a r l y a l w a y s p o s s i b l e t o r e a c ha new o l l i s i o n course-and obtain a new droppingrange angle i f t h e ' t a r g e t should make subsequent
( i f )
changes o f course or s p e e d , provided such do noto c c u r immediately b e f o r e t h e d r o p p i n g rangea ng l e i s reached.O n c e the attachments a r e s e t an d clamped, i ti s not n e c e s s a r y t o r e - s e t f o r any subsequentchanges of the aircraft course.O p e r a t i o n f o r wind d e t e r m i n a t i o n
E n e r g i z e t h e parent bomb s i g h t e l e c t r i c a l c i rc u i t s an d unlock an d l e v e l t h e . s i g h t gyro 5 5 , a si n b o m b i n g . ` Engage t h e r d i r e c t i o n a l o p e r a t i n gc l u t c h I 9 ' . S e t t h e t r u e heading o f t h e a i r c r a f ton the compass s c a l e 8 l o p p o s i t e l u b b e r s l i n e IM,a n d A c o u p l e the compass s c a l e 8 l > t o t h e s t a b i l i z e rcardan by means f k n o b v 9 4 . Assume a b a s ecourse m i d w ay between t w o d r i f t c o u r s e s . Thetwo d r i f t c o u r s e s sh o u l d , p r e f e r a b l y , b e about 6 0d e g r e e s a p a r t . R o t a t e s e c o n d a r y o p e r a t i n gc l u t c h 80" r i g h t o r l e f t , a s n e c e s s a r y , t o b r i n gthe a i r c r a f t on th e f i r s t d r i f t course an d thenengage t h e secondaryoperating c l u t c h . Thismovement o f t h e secondary o p e r a t i n g c l u t c h 8 0 moves the s t a b i l i z e d y . b r u s h y 3 4 over commutator3 5 , w h i c h , i n t u r n , i n d i c a t e s on t h e p i l o t s d i r e c #
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2 5 5 1 6 5 2 9 01 1t i o n ' > i n d i c a t o r i l t h e ` d i r e c t i o n i n l k which? t h e p i l o tmust turn to .center..ftherneedle thereof. ' Whent h e s e c o n d a r y v o p e r a t i n g ? ' c l u t c h 8 0 1 i s ; engaged,the needle o f the ' p i l o t s i z d i r e c t i o n i n d i c a t o r r emains centeredonlysas . l o n g a s the a i r c r a f t r emai ns on the s e t course, otherwise : t h e needlemovesoif on ene s i d e o r ' t h e other o f the c e n t e r ,depending o n which s i d e i o f the setdrift courset h e a i r c r a f t i s h e a d e d . SNOW, by r o t a t i n g > knob5 0 , r o t a t e s i g h t c a s i n g - ' 2 1 * a n d ' w i t h i t t e l e s c o p ev 5 1 5 t o t h e o b j e c t b e l o w ' b e i n g used f o r d r i f t ' d e t e rm i n a t i o n . This movementof knob 5 0 would, > i fthe secondary operating c l u t c h 8 9 " were not eng a g e d , cause the s t a b i l i z e d b r u s h f i an d a i s o then e e d l e o f the p i l o t d i r e c t i o n i n d i c a t o r t o move,but s t a b i l i z e d b r u s h - c o l l a r i 6 ! i s more t i g h t l yf r i c t i o n a l l y engaged t o m em b er 3 9 ( F i g . 4 ) thanm e m b e r 3 9 i s ' t o s l e e v e 4 0 , s o s l i p p a g e occurs between s l e e v e 4 B and m e m b e r ' , and the s t a b i l i z e db r u s h v 3 4 i s not moved. Afterthe s i g h t i s t r a i n e ds o ` .thatthe t e l e s c o p e c r o s s marks follow the obj e c t b e l o w b e i n g u s e d f o r d r i f t - d e t e r m i n a t i o n , t h ef i r s t " d r i f t ' a n g l e , " r i g h t > or'leftymayA be read ons c a l e 1 5 ( F i g . 1 ) o p p o s i t e the index on s i g h tc a s i n g " 2 1 . A f t e r o b t a i n i n g t h e f i r s t d r i f t a n g l e ,d i s e n e a g e both t h e d i r e c t i o n a l " o p e r a t i n g andthe secondary operating c l u t c h e s . By means o fthesecondary o p e r a t i n g c l u t c h , b r i n g t h e V a i rc r a f t t o t h e second d r i f t course and then clampt h e fsecondary o p e r a t i n g c l u t c h . ' W hen t h es e c o n d a r y o p e r a t i n g ' c l u t c h " 8 0 ' i s moved througha l a r g e a n g l e v i t w i l l be necessaryto mov e itinincrements - t o thenew'drift c o u r s e , a s to o g r e a tannovementwould . c a u s e t h e . s t a b i l i z e d b r u s h > ` 3 4tocontact one o f A i t s s t o p s at'the e n d o f thecommutator, and whenthis. occurs an y f u rther movementof the . c l u t c h w i l l merely causes l i p p a g e b e t w e e n . t h e memberil and . c o l l a r i E l .Of course, if -the s e c o n d a r y .operating clutch 80'i s moved` s u f l i c i e n t l y - ~ slowly t h a t V t h e v p i l o t can"follow with the a i r c r a f t , i t rmay? be movedthrough a c o n s i d e r a b l e . a n g l e > i n one movement .A f t e r the a i r c r a f t i s s t e a d y o n t h e second ` d r i f tc o u r s e , e n g a g e l t h e . d i r e c t i o n a l - o p e r a t i n g c l u t c hI 9 ' , an d by t h e s u s e ' o f f t h e f t u r n knob 5 0 , - a g a i nt r a i n t h e crossmarksof t h e - s i g h t t e l e s c o p e onthe object b e l o w b e i n g . A used - f o r l d r i f t determinat i o n > and obtain a d r i f t anglefor the second ' d r i f tcoursefin the same manner-:thatthe d r i f t angle df or theiirst drift course was obtained. ' The driftangle'obtained o n the f i r s t d r i f t c o u r s e A w i l l herei n a f t e r be nominated t h e r - ' f i r s t > d r i f t angle - thatobtained o n the second d r i f t c o u r s e r w i l l be termedt h e s e c o n d d r i f t a n g l e .J i i - I a v i n g . d e t e r m i n e d adrift angle onfeach o f t w o 'd r i f t c o u r s e s , t o determineJthe'fWind ` f o r c e f a n dd i r e c t i o n from t h e l o w . , a l t i t u d e bombingattachments, proceed a s f o l l o w s : Set an d clamp i n d ic a t e d r a i r speed o n a i r s s p e e d a r m ' 9 9 l ( F . - i g s . f 1 an dl 1 ) . Set base l c o u r s e oncompass c a l e 8 | . ; o p p os i t e movable. u b b e r s l i n e 1 4 1 an d clamp :compasss c a l e ' l ~ t o ` d r u m k l b y = knob 9 4 . - S e t an d clampapproximate windforcei'on wi nd arm | 2 1 . . ' M o v ed r i f t . i n d i c a t o r H4 > a l o n g : s c a l e I l i Y t o ; t h e r i ' g h to r V l e f t t o t i t h e . v a l u e ' o f Y t h e r s t ; d r i f t anglefdep e n d i n g : on whether" h i s : n a n g l e > i s r i g h t ' o r l e f t .S i m i l a r l y y s e t , d r i f t f i n d i c a t o r l l 3 f t o - t h e - ' r i g h t ' v o rl e f t t f o n s c a l e l i l Lto 4 t h e ` , v a i n e - o f t h e s e c o n d d r i f ta n g l e . Rotate w i n d g e a r ' . ` ' l l f v counter-clockwisei f i t h e second d r i f t ' c o u r s e f ' w a s k t o the r i g h t o f thef i r s t d r i f t c o u r s e ; o r i e c l o c k w i s e i f t o the e f t f o f thef i r s t - d r i f t cou-rse;untilupointery | 2 1 on `grou-nds p e e d arm I G 8 i s ' o p p o s i t e f d r i f t i n d i c a t o r I r | 4 , ~ > m o v i n g i n t h e i ' d i r e c t i o n o z d r i f t i n d i c a t o r I _ l 3 . . f D o ; not
35
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12l o c k - w i n d n g e a r ' f p t o r f c o m p a s s s c a l e 8 i . ~ M a t c hth e zero mark on mova ble s c a l e l f w i t h Y f i x e di n d i c a t o r 9 S . _ R o t a t e t h e wind ` g e a r 8 1 throughan angle equal t o t h e sumof the d i f f e r e n c e s between . t h e - f b a s e w c o u r s e and e a c h A d r i f t c o u r s e ,c o u n t e r - c l o c k w i s e i i f the s e c o n d A d r i f t c o u r s e i s ' t ot h e . - r i g h t . o f > thehrst; c l o c k w i s e i f - t h e secondd r i f t f c o u r s e . i s t o t h e f ` l e f t o f the f i r s t . W e n t h ewind > f o r c e i s c o r r e c t l y - s e t ; t h e p o i n t e r j i 2 i l o n t h eground * s p e e d * a r z n i k | 1 9 8 w i l l # move- from o p p o s i t ei n d i c a t o r l - M r t o o p p o s i t e i n d i c a t o r M 3 , a s - w i n dgear 8 1 i s r o t a t e d through t h e above a n g i e . " I ft h e y . z p o i n t e r d o e s notrmcve e x a c tl y ; a s o u t l i n e dabove; vary t he win d y f o r c e s e t on theiwind armi ' 2 1 > u n t i l i t d o e s . Asthe wind v e l o c i t y i s v a r i e d ;the-zero mark-on the movable . s c a l e 9 B w i l l g f i ngeneraLhave t o ' f be r e s e t toxed i n d i c a t o r - Z 2 9 8each time. '" W h e n t h e w i n d - . v e l o c i t y i s l f o u n d , s e t wind g e a r8 1 f o r thebase course c o n d i t i o n , i . e . , r o t a t e f i ti n a d i r e c t i o n o p p o s i t e l t o t h a t i n w h i c h ' l a s t movedand-"through an angle e q u a l v tothe d i i f e r e n c e b etweenlthebasecourse andthe` second d r i f t c o u r s e .Clamp W i n d gear 8 1 t o compass s c a l e 8 l b y l k n o b9 2 . ' R e a ' d ' t h e wind d i r e c t i o n on compass s c a l e 8 lopposite'the t a i l of the arrow o n th e wind'gear8 1 ." ' I t ' i s n o t f i n l g e n e r a l , n e c e s s a r y tony d i r e c t l yover the ground o b j e c t being used f o r d r i f t > obs e r v a t i o n s , as the c r a d l e 4 E S l ' o f the t e l e s c o p e 5 tmaybe i l t e d v a s much as 1 5 d e g r e e s - t o eithersideof the v e r t i c a l as necessary b y means of athwarts h i p s l e v e l l i n g k n o l d E 5 i n o r d e r tokeep t h e t e l escope o n t h e ' o b j e c t ,> I t w i l l be understood that the above d e s c r i pt i o n v an d accompanying drawings comprehendo n l y t h e g e n e r a l an d p r e f e r e d embodiment o f myi n v e n t i o n an d that v a r i o u s changes i n c o n s t r u ct i o n , p r o p o r t i o n and arrangement o f p a r t s maybe made within the ` s c o p e o f the appen ded claimswithout s a c r i f i c i n g any o f the advantagesof myi n v e n t i o n .>The i n v e n t i o n r described herein may be manuf a c t o r e d and/or u s e d . by o r _ f o r the G overnmentof the United' States of America for governmental purposes without t h e . V payment o f an yr o y a l t i e s t h e r e o n o r t h e r e f o r .' I claim:1 . Attachments f o r adapting an a i r c r a f t synchronized b o m b s i g h t forlowaltitude u s e . l s a i dsynchronized bomb sight having an azimuths t a b i l i z e r . gyro cardan, a s i g h t t e l e s c o p e ,a n d am e m b e r c o n t r o l l i n g v a - p i l o t . d i r e c t i o n i n d i c a t o r ,s a i d . . attachments v c o m p r i s i n g an a d j u s t a b l e andr o t a t a b l e clutch means, a r i g i d l i n k , an adjustablec o n a n - s a i d l i n k connecting s a i d clutchmeans t os a i d c o l l a r , y s a i d c l u t c h m eans b e i n g f r i c t i o n a l l ye n g a g e a - b l e t o s a i d c a r d a n , s a i d c o l l a r b e i n g f r i ct i o n a l l y engaged t o s a i d m e m b e r c o n t r o l l i n g s a i dp i l o t v d i r e c t i o n i n d i c a t o r , an a d j u s t a b l e c a l i b r a t e da i r speed arm, ' a n adjustable an d v r o t a t a b l e c a l ihratedground'speed arm, an adjustable and r ot a t a b l e c a l i b r a t e d wind arm, s a i d a i r speed arm,ground-speed arm and W in d a r m b e i n g interconnected t o form an'adjustable t r i a n g l e , ~ a t l e a s t o n erangeangle s c a l e a t t a c h a b l e a l o n g s a i d groundSpeed arm, a rotatable calibrated compass s c a l ef r i c t i o n l l l y . engageable t o s a i d cardan, a r o t a t a b l ec a l i b r a t e d win d gear concentric with s a i d compasss c a l e and f r i c t i c n a l l y e n g a g e a - b l e t h e r e t o ; an i d l e rpinion g e a r e d v t o both s a i d wind arm n d s a i d windgearaan annular c a l i b r a t e d movable s c a l e r e c e s s e di n . the upper face o f s a i d w i n d A gear an d concentrict h e r e w i t h , > . a n a d j u s t a b l e A i n s c r i b e d l u b b e r s l i n e
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2 , 5 1 8 , 2 9 01 3p l a t e d i s p o s e d a d j a c e n t t o s a i d compass s c a l e , axed i n d i c a t o r d i s p o s e d a d j a c e n t t o s a i d movables c a l e , a curved s l i d a b l e c a l i b r a t e d d r i f t angles c a l e , a t l e a s t one d r i f t a n g l e i n d i c a t o r l o n g i t u d in a l l y s l i d a b l e a l o n g s a i d d r i f t a n g l e s c a l e , an d ap o i n t e r x e d l y s e c u r e d t o s a i d ground speed-armw i t h i t s t i p d i s p o s e d a d j a c e n t t o s a i d d r i f t a n g l es c a l e .2 . In combination with an a i r c r a f t synchron i z e d b o m b s i g h t having an azimuth s t a b i l i z e rgyro cardan, a s i g h t telescope an d a member cont r o l l i n g p i l o t d i r e c t i o n i n d i c a t o r , a t t a c h m e n t sadapting s a i d synchronized b o m b s i g h t f o r lowa l t i t u d e u s e , s a i d attachments comprising an a d - `justable and rotatable clutch mea n s , a rigid l i n k . an a d j u s t a b l e c o l l a r , s a i d l i n k connecting s a i dclutch m e a n s t o s a i d c o l l a r , s a i d clutch m e a n s bei n g r i c t i o n a l l y e n g a g e a b l e t o s a i d c a r d a n , s a i dc o l l a r b e i n g i r i c t i o n a l l y engaged t o s a i d memberc o n t r o l l i n g s a i d p i l o t d i r e c t i o n i n d i c a t o r , an adj u s t a b l e c a l i b r a t e d a i r speed arm, an a d j u s t a b l e >an d r o t a t a b l e c a l i b r a t e d ground speed arm, ana d j u s t a b l e and r o t a t a b l e c a l i b r a t e d wind arm,said a i r speed arm, ground speed arm an d W i n darm being interconnected t o ' f orm an adjustablet r i a n g l e , a t l e a s t one range angle s c a l e attachablealong s a i d ground speed arm, a r o t a t a b l e c a l ibrated compass s c a l e f r c t i o n a l l y engageable t os a i d cardan, a r o t a t a b l e c a l i b r a t e d Wi nd gear conc e n t r i c with s a i d compass s c a l e and i r i c t i o n a l l yengageeble t h e r e t o , an i d l e r p i n i o n geared t o bothsaid w i n d arm an d said w i n d g e a r , an annularc a l i b r a t e d movable s c a l e r e c e s s e d i n the upperf a c e o f s a i d W in d gear and c o n c e n t r i c t h e r e w i t h ,an a d j u s t a b l e i n s c r i b e d l u b b e r s l i n e p l a t e d i sposed adjacent t o s a i d compass s c a l e , a i i x e d i nd i c a t o r d i s p o s e d a d j a c e n t t o s a i d movable s c a l e ,a curved s l i d a b l e c a l i b r a t e d d r i f t angle s c a l e , a tl e a s t one d r i f t angle i n d i c a t o r l o n g i t u d i n a l l y s l i da b l e along s a i d d r i f t a n g l e s c a l e , an d a p o i n t e rxedly secured t o s a i d ground speed arm with i t st i p d i s p o s e d a d j a c e n t t o s a i d d r i f t a n g l e s c a l e .
3 . Attachments f or adapti ng an aircraft sy nchronized b o m b s i g h t f o r low a l t i t u d e u s e , s a i dsynchronized bomb sight having an azimuth .s t a b i l i z e r gyro c a r d a n , a s i g h t t e l e s c o p e and am em b er c o n t r o l l i n g a p i l o t d i r e c t i o n i n d i c a t o r ,s a i d attachments comprising an a d j u s t a b l e t r ia n g l e f o r s o l v i n g a i r c r a f t ground s p e e d , a t l e a s ton e > r a n g e angie s c a l a . l a t t a - e n a b l e t o s a i d t r i a n g l e ,a V s l i d a b l e d r i f t a n g l e s c a l e , a p o i n t e r attached t os a i d t r i a n g l e an d d i s p o s e d a d j a c e n t t o s a i d d r i f ta n g l e s c a l e i o r i n d i c a t i n g d r i f t a n g l e s , a r o t a t a b l ec l u t c h f r i c t i o n a l l y e n g a g e a b l e t o s a i d cardanan d f r i c t i o n a l l y connected t o s a i d member cont r o l l i n g s a i d p i l o t d i r e c t i o n i n d i c a t o r , a r o t a t a b l ecompass s c a l e attachable t o s a i d c a r d a n , a windgear concentric with s a i d compass s c a l e an d a ttachable t h e r e t o , an annular movable s c a l e conc e n t r i c with s a i d wi nd gear and supported t h e r eb y , an a d j u s t a b l e i n s c r i b e d l u b b e r s l i n e p l a t e d i sposed adjacent t o s a i d compass s c a - i e , a f i x e d i nd i c a t o r d i s p o s e d a d j a c e n t t o s a i d movable s c a l e ,an d an i d l e r p i n i o n gearing s a i d t r i a n g l e t o s a i dW i n d gear f o r maintaining the c o r r e c t r e l a t i o ns h i p o f s a i d wind gear t o s a i d t r i a n g l e .4 . In combination with an a i r c r a f t synchron i z e d b o m b s i g h t having an azimuth s t a b i l i z e rgyro cardan, a s i g h t t e l e s c o p e an d a memberc o n t r o l l i n g a p i l o t d i r e c t i o n i n d i c a t o r , attach- iments a d a p t i n g s a i d s y n c h r o n i z e d bomb s i g h t t olow a l t i t u d e u s e , s a i d attachments comprising ana d j u s t a b l e t r i a n g l e f o r s o l v i n g a i r c r a f t grounds p e e d , a t l e a s t one range angle s c a l e attachablet o s a i d t r i a n g l e , a s l i d a b l e d r i f t angle s c a l e , a
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1 4p o i n t e r a t t a c h e d ` t o s a i d t r i a n g l e an d d i s p o s e da d j a c e n t t o s a i d d r i f t a n g l e s c a l e f o r i n d i c a t i n gd r i f t a n g l e s , a . r o t a t a b l e c l u t c h f r i c t i o n a l l y eng a g e a b l e t o s a i d cardan an d i r i c t i o n a l l y cc nn e c t e d t o s a i d member c o n t r o l l i n g s a i d p i l o t d i - , A >r e c t i o n i n d i c a t o r , a r o t a t a b l e compass s c a l e a ttachable t o s a i d cardan, a wind gear c o n c e n t r i cwith s a i d compass s c a l e and a t t a c h a b l e t h e r e t o ,an annular movable s c a l e concentric with s a i dwind g e a r and supported t h e r e b y , an a d j u s t ab l e i n s c r i b e d l u b b e r s l i n e p l a t e d i s p o s e d a d j a c e n tt o s a i d compass s c a l e , a f i x e d i n d i c a t o r d i s p o s e dadjacent t o s a i d movable s c a l e , an d an i d l e rp i n i o n g e a r i n g s a i d t r i a n g l e t o s a i d wind g e a rf o r maintaining t h e c o r r e c t r e l a t i o n s h i p o f s a i dwind g e a r t o s a i d t r i a n g l e .5 . Attachments adapting an a i r c r a f t synchron i z e d bomb s i g h t f o r low a l t i t u d e u s e , saidsync h r o n i z e d bom b s i g h t having a c a s i n g member,an azimuth s t a b i l i z e r gyro cardan, a s i g h t t e l e - ~scope an d a member o n t r o l l i n g a p i l o t d i r e c t i o ni n d i c a t o r , s a i d attachments c o m p r i s i n g a mounti n g b r a c k e t a t t a c h e d t o s a i d ' c a s i n g member, ah o r i z o n t a l b a s e I p l a t e s u p p o r t e d by s a i d b r a c k et ,a p a i r o f i n v e r t e d L-shaped b a r s r i g i d l y securedt o the upper f a c e o f s a i d base p l a t e , a " s c a l e c a l ibrated i n a i r speed a t t a c h e d t o t h e upper f a c e ` o feach s a i d i n v e r t e d L-shaped b a r , an a i r speedi n d i c a t o r b a r > with a c r o s s - i n d e x thereon andav e r t i c a l c y l i n d r i c a l e x t e n s i o n i n t e g r a l t h e r e w i t hs l i d a b l y p o s i t i o n e d between s a i d i n v e r t e d Lshaped b a r s , a h o r i z o n t a l r o t a t a b l e wind d i s cwith gear t e e t h i n t h e ri m t h e r e o f j o u r n a l e d i ns a i d base p l a t e , a p a i r o f i n v e r t e d L-shaped memb e r s r i g i d l y s e c u r e d t o t h e upper f a c e o f s a i dwind d i s c an d symmetrically d i s p o s e d about adiameter t h e r e o f , a s c a l e c a l i b r a t e d i n wi nd vel o c i t y a t t a c h e d t o theupper f a c e o f e a c h L-shapedmember, a w i nd bar with a cross-index thereonand a v e r t i c a l c y l i n d r i c a l p r o j e c t i o n i n t e g r a lt h e r e w i t h s l i d a b l y d i s p o s e d between s a i d L-shapedmember s , a calibrated gr oun d speed arm withv al o n g i t u d i n a l through s l o t t h e r e i n , one end o fs a i d ground speed arm being r o t a t a b l y connectedt o s a i d c y l i n d r i c a l e x t e n s i o n , with s a i d c y l i n d r ic a l p r o j e c t i o n b e i n g s l i d a b l y an d r o t a t a b l y d i sposed i n s a i d s l o t , a knob means f o r l o c k i n g s a i dwind bar i n p l a c e a l o n g s a i d i n v e r t e d L-shapedmembers, a knob means f o r l o c k i n g s a i d a i r speedi n d i c a t o r b a r > i n p l a c e a l o n g s a i d i n v e r t e d Lshaped b a r s , a curved c a l i b r a t e d d r i f t - a n g l e s c a l eattached t o ' a n d s l i d a b l e with s a i d a i r s p e e d i nd i c a t o r b a r , a p o i n t e r xedly s e c u r e d t o t h e endo f s a i d ground speed arm connected t o S a i d o y 'l i n d r i c a l e x t e n s i o n w i t h t h e ti p o f s a i d Y p o i n t e rd i s p o s e d a d j a c e n t t o s a i d d r i f t a n g l e s c a l e , a tl e a s t one movable d r i f t a n g l e i n d i c a t o r l o n g i t u d i - vn a l l y s l i d a b l e a l o n g s a i d d r i f t a n g l e s c a l e , a drum`r i g i d l y L a t t a c h e d t o s a i d c a r d a n , an a d j u s t a b l ean d r o t a t a b l e c l u t c h d i s p o s e d around s a i d drum,an operating knob and an adjusting knob f o r s a i dc l u t c h , a r i g i d l i n k , an a d j u s t a b l e c o l l a r i n f r i ct i o n a l engagement with s a i d m e m b e r o f s a i d sync h r o n o u s bomb s i g h t f o r c o n t r o l l i n g s a i d p i l o td i r e c t i o n i n d i c a t o r , s a i d l i n k c o n n e c t i n g s a i dc l u t c h t o s a i d c o l l a r , a h o r i z o n t a l r o t a t a b l e comp a s s s c a l e , an e x t e r n a l l y threaded v e r t i c a l y s l e e v eattached t o and c o n c e n t r i c with s a i d compasss c a l e an d p a s s i n g through a c e n t r a l c i r c u l a r openi n g t h e r e i n , a l o c k i n g s c r e w d i s p o s e d w i t h i n s a i ds l e e v e , the lower en d o f saidlocking screw eng a g i n g s a i d c a r d a n an d f r i c t i o n a l l y l o c k i n g s a i dcompass s c a l e t o s a i d drum when screwed d o w n , an i n t e g r a l knob a t t h e upper end o i s a i d l o c k i n gs c r e w , a r o t a t a b l e h o r i z o n t a l W i n d g e a r sup
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2 , 5 1 6 , 2 9 015p o r t e d ~ b y . - s a i d compass s c a l e an d c o n c e n t r i ct h e r e w i t h , a n ` annular c a l i b r a t e d movable s c a l edisposed i n a e c e s s in the upper f a c e r o f saidwi nd gear an d concentric therewith, a v knob e n - `gaging the externall threaded portion of saids l e e v e v t o l o c k s a i d wi nd gear t o s a i d compasss c a l e w hen screwed down, a h o r i z o n t a l i d l e r p i n - i o n v r o t a t a b l e about a x e d v e r t i c a l shaft extendi n g from s a i d b a s e p l a t e and meshing with t h et e e t h o f s a i d wind d i s c , an a d j u s t a b l e i n s c r i b e dl u b b e r s l i n e p l a t e d i s p o s e d adjacent t o s a i d co mpass s c a l e , and a n x e d i n d i c a t o r disposed adjacent t o s a i d movable s c a l e .6 . In combination with an a i r c r a f t synchron i z e d b o m b s i g h t having a c a s i n g member, anazimuth s t a b i l i z e r g y r o c a r d a n , a s i g h t t e l e s c o p eanda m e m b e r c o n t r o l l i n g a p i l o t d i r e c t i o n i n d ic a t o r , a t t a c h m e n t s a d a p t i n g s a i d s y n c h r o n i z e db o m b s i g h t f o r low a l t i t u d e u s e , s a i d attachmentscomprising a mounting bracket attached t o s a i dc a s i n g member, a h o r i z o n t a l b a s e p l a t e s u p p o r t e dby s a i d b r a c k e t , a p a i r o f i n v e r t e d L-shaped b a r sr i g i d l y s e c u r - e d t o the upper f a c e o f s a i d basep l a t e , a s c a l e c a l i b r a t e d i n a i r speed attached t othe upper f a c e o f each s a i d i n v e r t e d L-shapedb a r , an a i r speed i n d i c a t o r bar with a c r o s s i ndex thereon an d a v e r t i c a l c y l i n d r i c a l extensioni n t e g r a l t h e r e w i t h s l i d a b l y p o s i t i o n e d betweens a i d i n v e r t e d L-shaped b a r s , a h o r i z o n t a l r o t a ta b l e wi nd d i s c with gear teeth i n the r i m . thereo f journaled i n s a i d base p l a t e , a p a i r o f i n v e r t e dL-shaped members r i g i d l y s e c u r e d t o t h e upperf a c e o f s a i d wind d i s c an d s y m m e t r i c a l l y d i sposed about a diameter t h e r e o f , a s c a l e c a l ibrated i n wind v e l o c i t y attached t o the upperface o f each L-shaped member, a wi nd bar witha c r o s s index thereon and a v e r t i c a l cylindricalp r o j e c t i o n i n t e g r a l t h e r e w i t h s l i d a b l y d i s p o s e dbetween s a i d L-shaped members, a c a l i b r a t e dground speed arm with a l o n g i t u d i n a l throughs l o t t h e r e i n , one end o f s a i d ground speed armb e i n g r o t a t a b l y connected t o s a i d c y l i n d r i c a l e xt e n s i o n , w i t h s a i d c y l i n d r i c a l p r o j e c t i o n b e i n gs l i d a b l y and r o t a t a b l y d i s p o s e d i n s a i d s l o t , aknob m e a n s f o r l o c k i n g s a i d wi nd bar i n p l a c ealong s a i d i n v e r t e d L-shaped members, a knobmeans f o r l o c k i n g s a i d a i r speed i n d i c a t o r bar i np l a c e along s a i d i n v e r t e d L-shaped b a r s , a curvedc a l i b r a t e d d r i f t a n g l e s c a l e attached t o and s l i da b l e with s a i d a i r speed i n d i c a t o r b a r , a p o i n t e rxedly s e c u r e d t o t h e end o f s a i d ground speedarm connected t o s a i d c y l i n d r i c a l extension witht h e t i p o f s a i d p o i n t e r d i s p o s e d a d j a c e n t t o s a i dd r i f t a n g l e s c a l a - a t l e a s t one movable d r i f t a n g l ei n d i c a t o r l o n g i t u d i n a l l y s l i d a b l e a l o n g s a i d d r i f ta n g l e s c a l e , a drum i g i d l y attached t o s a i d c a rd a n , an a d j u s t a b l e and r o t a t a b l e c l u t c h d i s p o s e daround s a i d drum, an operating knob and an adj u s t i n g knob f o r s a i d c l u t c h , a r i g i d l i n k , an adj u s t a b l e c o l l a r i n f r i c t i o n a l engagement with s a i dm e m b e r o f s a i d synchronous b o m b s i g h t f o r cont r o l l i n g s a i d p i l o t d i r e c t i o n i n d i c a t o r , s a i d l i n kconnecting s a i d c l u t c h t o s a i d c o l l a r , a h o r i z o n t a lr o t a t a b l e compass s c a l e , an e x t e r n a l l y threadedv e r t i c a l s l e e v e attached to-and c o n c e n t r i c withs a i d compass s c a l e an d p a s s i n g through a c e n t r a lc i r c u l a r opening t h e r e i n , a l o c k i n g screw d i sp o s e d W i t h i n s a i d s l e e v e , t h e l o w e r end o f s a i dl o c k i n g screw engaging s a i d cardan an d f r i ct i o n a l l y l o c k i n g s a i d compass s c a l e t o s a i d drumw hen screwed down, an i n t e g r a l knob a t the upper en d o f said l o c k i n g s c r e w , a r o t a t a b l e h o r iz o n t a l wind g e a r supported by s a i d compass s c a l eand c o n c e n t r i c t h e r e w i t h , an annular c a l i b r a t e dmovable s c a l e d i s p o s e d i n a r e c e s s i n t h e u p p e r `
1 5
20
2 5
30
35
45
50
56
65
7 0
7 , 5
16f a c e o f s a i d wind gear and c o n c e n t r i c t h er e w i t h ,a knob engaging t h e e x t e r n a l threaded p o r t i o n o fs a i d s l e e v e t o l o c k s a i d wind gear t o s a i d co mpass s c a l e when screwed down, a h o r i z o n t a l i d l e rpinion r o t a t a b l e about a x e d v e r t i c a l shaft ext e n d i n g rom s a i d b a s e p l a t e an d meshing w i t hthe teeth o f s a i d wi nd d i s c , an adjustable i ns c r i b e d l u b b e r s l i n e p l a t e d i s p o s e d a d j a c e n t t os a i d compass s c a l e , an d - a i i x e d i n d i c a t o r d i sposed a d j a c e n t t o s a i d movable s c a l e .' 7 . Attachments adapting an a i r c r a f t synchronized bomb s i g h t f o r low a l t i t u d e u s e , s a i d synchronized b o m b s i g h t having an azimuth s t a b il i z e r gyro cardan, a s i g h t t e l e s c o p e an d a memberc o n t r o l l i n g a p i l o t d i r e c t i o n i n d i c a t o r , s a i d a ttachments comprising a h o r i z o n t a l base p l a t e , ap a i r o f i n v e r t e d L-shaped b a r s r i g i d l y s e c u r e d t othe upper f a c e o f s a i d base p l a t e , a s c a l e c a l ibrated i n a i r speed attached t o the upper f a c e o feach s a i d i n v e r t e d L-shaped b a r s , an a i r speedindicator bar with a c r o s s index thereon and av e r t i c a l c y l i n d r i c a l e x t e n s i o n i n t e g r a l t h e r e w i t hs l i d a b l y p o s i t i o n e d between s a i d i n v e r t e d Lshaped b a r s , a h o r i z o n t a l r o t a t a b l e wind d i s cwith g e a r t e e t h i n t h e ri m t h e r e o f j o u r n a l e d i ns a i d base p l a t e , a p a i r o f i n v e r t e d L-shaped memb e r s r i g i d l y secured t o the upper f a c e o f s a i d windd i s c an d symmetrically d i s p o s e d about a diame t e r t h e r e o f , a s c a l e c a l i b r a t e d i n wind v e l o c i t yattached t o the upper face o f each L-shapedm e m b e r , a w i n d bar with a cross index thereonand a v e r t i c a l c y l i n d r i c a l p r o j e c t i o n i n t e g r a lt h e r e w i t h s l i d a b l y d i s p o s e d between s a i d Lshaped members, a c a l i b r a t e d ground speed armwith a l o n g i t u d i n a l through s l o t t h e r e i n , one endo f s a i d ground speed arm being r o t a t a b l y conn e c t e d t o s a i d c y l i n d r i c a l e x t e n s i o n ' , with s a i dc y l i n d r i c a l p r o j e c t i o n b e i n g s l i d a b l y an d o t a t a b l ydisposed i n said s l o t , a knob m e a n s f o r l o c k i n gs a i d wind bar i n p l a c e along s a i d i n v e r t e d Lshaped members, a knob means f o r locking s a i da i r s p e e d i n d i c a t o r bar i n p l a c e a l o n g s a i d i nverted L-shaped b a r s , a curved c a l i b r a t e d d r i f ta n g l e s c a l e attached t o and s l i d a b l e with s a i d a i rspeed i n d i c a t o r b a r , a p o i n t e r f i x e d l y s e c u r e d t othe end o f s a i d ground speed arm connected t os a i d c y l i n d r i c a l e x t e n s i o n with t h e t i p o f s a i dp o i n t e r d i s p o s e d a d j a c e n t t o s a i d d r i f t a n g l es c a l e , a t l e a s t one movable d r i f t angle i n d i c a t o rl o n g i t u d i n a l l y s l i d a b l e a l o n g s a i d d r i f t a n g l e s c a l e ,a drum i g i d l y attached t o s a i d cardan, an adj u s t a b l e an d r o t a t a b l e c l u t c h d i s p o s e d arounds a i d drum, a r i g i d l i n k , an a d j u s t a b l e c o l l a r i nf r i c t i o n a l engagement with s a i d m em b er o f s a i ds y n c h r o n o u s bomb s i g h t fo r c o n t r o l l i n g s a i d p i l o td i r e c t i o n i n d i c a t o r , s a i d l i n k c o n n e c t i n g s a i dclutch t o s a i d c o l l a r , a horizontal r o t a t a b l e compass s c a l e , an e x t e r n a l l y threaded v e r t i c a l s l e e v eattached t o an d c o n c e n t r i c with s a i d compasss c a l e an d passing `through a c e n t r a l c i r c u l a ropening t h e r e i n , a l o c k i n g screw d i s p o s e d withins a i d s l e e v e , the lower e nd of s a i d l o c k i n g screwengaging s a i d cardan an d r i c t i o n a l l y l o c k i n gs a i d compass s c a l e t o s a i d drum w hen screweddown, an i n t e g r a l knob a t t h e upper end o f s a i dlocking screw, a rotatable horizontal w i n d gearlsupported by s a i d compass s c a l e and c o n c e n t r i ct h e r e w i t h , an annular c a l i b r a t e d movable s c a l edisposed in a r e c e s s i n the upper face of s a i d .W i n d gear an d concentric therewith, a knob e n ~gaging t h e e x t e r n a l threaded p o r t i o n o f s a i ds l e e v e t o lock said win d gear t o s a i d compasss c a l e wh e n screwed down, a h o r i z o n t a l i d l e r p i n - Aion rotatable about a iixed vertical shaft e xte nd -i n g from s a i d k b a s e p l a t e an d meshing w i t h t h e :
7/30/2019 Barth 1939 US2516290
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t e e t h o f s a i d wind d i s e , en a d j u s t a b i e i n s c r i b e dl u b b e r s l i n e . p l a t e d i s p o s e d a d j a c e n t t o s a i d co mp a s s s c a l e , and a l i x e d i n d i c a t o r d i s p o s e d adjacent t o s a i d movable s c a l e .8 . In combination with a n a i r c r a f t synchron i z e d b o m b s i g h t having an azimuth s t a b i l i z e rgyro cardan, a s i g h t t e l e s c o p e an d a m e m b e rc o n t r o l l i n g > a p i l o t d i r e c t i o n i n d i c a t o r , a t t a c hments a d a p t i n g s a i d s y n c h r o n i z e d b o m b s i g h t f o rlow a l t i t u d e u s e , s a i d attachments comprising ah o r i z o n t a l base p l a t e , a p a i r o f i n v e r t e d Lshaped b a r s r i g i d l y s e c u r e d t o t h e upper f a c e o fs a i d base p l a t e , a s c a l e c a l i b r a t e d i n a i r speedattached t o t h e upper f a c e o f each s a i d i n v e r t e dL-shaped b a r , an l a i r speed i n d i c a t o r bar with across index thereon an d a v e r t i c a l c y l i n d r i c a l ext e n s i o n i n t e g r a l t h e r e w i t h s l i d a b l y p o s i t i o n e d b etween s a i d i n v e r t e d L-shaped b a r s , a h o r i z o n t a lr o t a t a b l e W in d d i s c with gear t e e t h i n the rimt h e r e o f j o u r n a l e d i n s a i d base p l a t e , a p a i r o fi n v e r t e d L-shaped members r i g i d l y s e c u r e d t othe upper f a c e o f s a i d W i n d d i s c an d symmetric a l l y d i s p o s e d about a diameter t h e r e o f , a s c a l ec a l i b r a t e d i n wind v e l o c i t y attached t o t h e upperf a c e o f each L-shaped member, a wind b a r w i t ha cross index thereon an d a v e r t i c a l c y l i n d r i c a lp r o j e c t i o n i n t e g r a l t h e r e w i t h s l i d a b l y d i s p o s e dbetween s a i d L-shaped members, a c a l i b r a t e dground speed arm with a l o n g i t u d i n a l throughs l o t t h e r e i n , one end o f s a i d ground speed arm b ei n g r o t a t a b l y connected t o s a i d c y l i n d r i c a l ext e n s i o n , w i t h s a i d c y l i n d r i c a l p r o j e c t i o n b e i n gs l i d a b l y an d r o t a t a b l y d i s p o s e d i n s a i d s l o t , aknob means f o r l o c k i n g s a i d wind bar i n p l a c ea l o n g s a i d i n v e r t e d L-shaped member, a knobmeans f o r l o c k i n g s a i d a i r speed i n d i c a t o r bari n p l a c e a l o n g s a i d i n v e r t e d L-shaped b a r s , acurved c a l i b r a t e d d r i f t a n g l e s c a l e a t t a c h e d t oand s l i d a b l e with s a i d a i r speed i n d i c a t o r b a r , ap o i n t e r f i x e d l y s e c u r e d t o t h e end o f s a i d groundspeed arm connected t o s a i d c y l i n d r i c a l e x t e n s i o nw i t h t h e t i p o f s a i d p o i n t e r d i s p o s e d a d j a c e n t t os a i d d r i f t angle s c a l e , a t l e a s t one movable d r i f ta n g l e i n d i c a t o r l o n g i t u d i n a l l y s l i d a b l e a l o n g s a i dd r i f t a n g l e s c a l e , a drum r i g i d l y a t t a c h e d t o s a i dc a r d a n , an a d j u s t a b l e and r o t a t a b l e c l u t c h d i sp o s e d around s a i d drum, a r i g i d l i n k , an a d j u s t
1 0
20
25
3 0
3 5
45
2 , 8 1 8 , 2 9 0 1 8a b l e c o l l a r i n f r i c t i o n a l e n g a g e m e n t w i t h s a i dm e m b e r o f s a i d synchronous b o m b s i g h t f o r cont r o l l i n g s a i d p i l o t d i r e c t i o n i n d i c a t o r , s a i d l i n kc o n n e c t i n g s a i d c l u t c h t o s a i d c o l l a r , a h o r i z o n t a lr o t a t a b l e compass s c a l e , an e x t e r n a l l y threadedv e r t i c a l s l e e v e a t t a c h e d t o an d c o n c e n t r i c withs a i d compass s c a l e and p a s s i n g through a c e n t r a lc i r c u l a r opening t h e r e i n , a l o c k i n g screw d i s p o s e dwithin s a i d s l e e v e , t h e l o w e r end o f s a i d l o c k i n gscrew engaging s a i d cardan an d f r i c t i o n a l l y l o c ki n g s a i d compass s c a l e t o s a i d dru m w hen screweddown, an i n t e g r a l knob a t the upper end o f s a i dl o c k i n g s c r e w , a r o t a t a b l e h o r i z o n t a l wind gears u p p o r t e d by s a i d compass s c a l e and c o n c e n t r i ct h e r e w i t h , an annular c a l i b r a t e d movable s c a l ed i s p o s - e d i n a r e c e s s i n the upper face o f s a i dw i n d gear and concentric therewith, a knob eng a g i n g t h e e x t e r n a l threaded p o r t i o n o f s a i ds l e e v e t o l o c k s a i d wi nd gear t o s a i d compasss c a l e when screwed down, a h o r i z o n t a l i d l e r pini o n r o t a t a b l e about a f i x e d v e r t i c a l s h a f t extendi n g from s a i d b a s e p l a t e an d meshing with t h et e e t h o f s a i d wind d i s c , an a d j u s t a b l e i n s c r i b e dl u b b e r s l i n e p l a t e d i s p o s e d a d j a c e n t t o s a i d c o r np a s s s c a l e , and aflxed i n d i c a t o r d i s p o s e d t o s a i dcompass s c a l e , and a X - e d i n d i c a t o r d i s p o s e d adj a c e n t t o s a i d movable s c a l e .
THEODORE H. BARTH.REFERENCES CITED
The f o l l o w i n g r e f e r e n c e s a r e o f r e c o r d i n the i l e o f t h i s p a t e n t :UNITED STATES PATENTS
N u m b e r Name Date1 , 3 1 4 , 4 2 8 Pollen e t a l _________ Aug. 2 6 , 19191,315,065 Wimperis ________ __ Sept. 2 , 1 9 1 91,36 3,011 Pollen et a l _________ Dec . 2 1 , 1 9 201,383, 660 Proc tor ___________ __ J u l y 5 , 1 9 2 11,784,929 E s t o p p e y _________ __ Dec. 1 6 , 1 9 3 01,942,536 Cl e m e nti __________ __ Jan. 9 , 1 9 3 41,985,077 Burkhardt _______ __ Dec. 1 8 , 1 9 3 4
FOREIGN PATENTSNumber Country Date1 4 5 , 8 1 0 . G r e a t B r i t a i n -_______ July 8 , 1920
