UNCLASSIFIED

AD NUMBER

LIMITATION CHANGESTO:

FROM:

AUTHORITY

THIS PAGE IS UNCLASSIFIED

ADA801586

Approved for public release; distribution isunlimited.

Distribution authorized to U.S. Gov't. agenciesand their contractors;Administrative/Operational Use; DEC 1945. Otherrequests shall be referred to Office ofScientific Research and Development,Washington, DC 20301.

SOD memo dtd 2 Aug 1960

Reproduced by

AIR DOCUMENTS DIVISION

t i

HEADQUARTERS AIR MATERIEL COMMAND

WRIGHT FIELD. DAYTON, OHIO

/

Reproduced by

US. GOVERNMENT /

IS ABSOLVED

FROM ANY LITIGATION WHIO MAY

ENSUE FROM THE CONTRACTORS IN -

FRINGING ON THE FOREIGN PATENT

RIGHTS WHICH MAY BE INVOLVED.

'»- ■?.*!■

£&i£ä£&ä2*j^&

»

«I.V.-- j'if "MIL 3Ä*»/t-fcfwr **i ^;- -f ^-in Ä A

<

r\ i <

> j

1

r *'l 1

1' -* Hl

i

A MOST Or AlfXAXaCltAPT TRACKZW9

MM! Hapert märnr content OEM »r IM

low« Stau collog»

\, lamm

ua zz

V. A Una» off Official intvatlcater

Barolv. i. .:aa'>cill Spoolal consultant

San L»i void

rm aWi'Li.KEHTAr.Y BEFOF.T 0!J TF.ACJCISQ II

This report co.-vletes the study oi trackin;, with

the "job miniature" do. crlbed In detail in previous reports.

In It will be found the results of oxperLaonts conducted

(e) to determine the efieet of periods of Inactivity on

tracking ability and (b) to resolve any dlffsrences in trac'..-

ing for :ionocular vs. binocular vision*

In part (a) tests were aade with subjects who were

experienced in tracking last suaraor and who returned to

school this fall after a month's vacation. Tost» using

veloclty-ulroct and accaleraiIon-velocity-direct settings

were used so that any differences in the two oould be de-

tected. In order to have true learning curves with which

to compare the data for the experienced people, groups of

inexperienced subjects were tested for one week with corres-

ponding .>paratur settings.

Tli- tests were conducted as deserlbed in previous

reports, lach subject was asked to take twenty tests in a

given week and the tost: were spaced at least an hour apart.

The subjscts were .a'd for each eet of twenty tests ooipleted.

Feeulte

The results of the experiments with alded-laying (or

velocity-direct tracking, d/v » .17 see») are shown in lift a.

4. -2-

LEARNING- CUHVE C0~PARI5CN, TEST 27

Ap'^earanre Number

r

3

Speed 1»

»»

A«

Mi

/■/#

/« AM

0.M

*/* *♦*

|tf »»

0.11 > l i ¥ f t > t ) It li ti >) M If I* n ig i$ it

Appearance Number

A CURVE FOR SELECTED NOVICES

B CURVE FOR EXPERIENCED SUBJECTS AFTER k .YEEKS' INACTIVITY.

FIfKJRE of

/

■BJB

A« Indicated on tie ula ra JB, eurvee A are ttie oompoeite

learning curve* for a selected , roup of novice«• Of a

group of thirteen under teat the seven best were choaen

for the study. This «aa done In order to have comparable

groups for the eurves ahovm. Curvea : are the «i,o«'ti

learning, curvea for a .jroup of experienced aubjeete who had

not taken testa for four weeks» It «111 be noted that for

both apeuda* 3 and 4 the experienced subjects approached ti.e

horltontal .ortio. of their learning curvea auch eooner than

did the novices, however, the fact tl.at curve ! drops sli.ht-

lj in the earl, trials lnaleatea that inactivity on the .art

of the ..jaeta ruduced their oyeratin*. aklll perceptibly.

In . lcure p are ehown curvea for velocity-direct

tracking for experienced aubjeete who were inactive for nine

wecke* curvea A are the composite learning ourvea for seven

aeleoted novloea (cane curvea aa in Hß. a) and curvea I are

the composite learning curvea for U.e experienced eubjeete.

A oojvariaon of the curvea in 2lguro a vlth those in 11 eure p

ahowa that the retentlvlty of the croup Idle for ten weeks la

about ti.e asute aa that for the experienced aubJaeta inactive

for four weeka. In prevloua experiments we ).ave noted a

similar »-erceptible drop in the „irst few triala for subjects

■

The eourae are tan pt waa used, ior epeed S, p ■ .071 sec."1 and for apeed 4, p • «126 sec."1. lor details aee , rev'.ous roperts•

■

-4-

LEARNING CURVE COMPARISON, TEST 27

a 7o v Spaed 3

««# \

3 a«

x y—>fl *** ^s. /

Mi _ ^***——- / £

~~—•■•

AM I » # # * 4 » i t it H it n n if K IT /t i» to

ADDMranei Niur.bar

it» Soeed L

tit \

/" 1

/.» \

/»» i \ / *

Ul \/

imm \

1.11 \

lit \

IM V /.p# V

n />•* \ j,l

3 AM X

6.1» ^

Ml

ort / ß /

0.40 /

0.1$ _/

AM

AM littst T t s it ii n if to o n IT ir a to

ADsear&nce Number

/4 CURVE FOR SELECTED NOVICES.

o D CURVE FOR EXPERIENCED SUBJECTS AFTER ± PEEKS' INACTIVITY.

I ■ 11

FIGURE ß

WIJO were Inactive for Just two days.

In 1 V.urc Y «re shown learning curves for accelera-

tion- velocity-direct ap.ara tue setting« (d/v a .17 sec,

a/v « 1.7 see« ). curves A are tlia corvoalto loamli.c

curves for a dlffarant .ro-.:;. of sevo novlcea selected aa

described before, curve« . are tl* composite learning curves

for experienced subjects who had been Inactive for a period

of aix weeks. TJ o ourvoa A Level ofi rat. < r r». Uly allowing

tliat ao'ie de;-reu of facility la aequ*rod by tlis novloea at

once» Curves I a^.aln indicate high retentlvity on the ..art

of the experienced subjects, A comparison of the crves in

Ficure v with those In . :, uro a and ß reveals t:.at tracking

is eaaler and more accurate with acceieration-vcioclty-

direot setting's than with ordinary aided laying. ThJa -.iay

be a result of ti.o noro leisurely rate at which tlie subject

-mat react wltli aocelerational tracking, an observation which

was also iAde in ti* preceding report on tracking •

To determine the differences in monocular veraus

binocular vision in tracking, a . rou; of experienced aubjecta

took tests one week usl:v two eyes and tie following w«ek

ualn ' one eye« rr. the latter experiment a lu'.tt le opaque

screen was used for blocking the vision of the subjsot's non-

preferred eye. The learning curves were .Tactically coin-

cident and are Identical with ourves b, rig» a. Tlje averages

of the last tan runs In each eaae were calculated and are

■

r

-ö-

rorat-i LEARH1K3 CURVE COMPARISON, TEST 409

Appwanc« Wimkmr

A CUBVE FOR SELECTED KOVICBS.

& CURVE FOR EXPERlfc'EEC SUBJECTS AFTER ft ASEHS' IMACTIVITT.

FIGURE r

-7-

M fOllOV«I

Monocular

linooular

The teat average» aboi

two euMi

Error in mil« apood 8

Error in alia Spood 4

•168 ♦ .008 .879 ♦ «006

•178 ♦ ,006 .879 ♦ .008

•ho« very little difference in the

I

IN ̂̂^H 1 •

Kj HA

EM i^B

TITLE: A Study of Antiaircraft Tracking, Supplementary Report n

AUTHOR(S): Atanasoff, John V.; Caskill, Harold V.; Legvold, Sam ORIGINATING AGENCY:Iowa State College, Ames, Iowa PUBLISHED BY:Office of Scientific Research and Development, NDRC, Dlv. 7

ATTD- 34405

(None) O«10. AOENCY NO. ICY HO.

(None) MIIUSH1NO AGtNCT HO. (None)

(None) U.S. IANOUAM

Eng. lUUSTtATIONS graphs

ABSTRACT:

A final report is given on a study of antiaircraft tracking with the "job miniature," described in a previous report. Experiments were conducted to determine the effect of periods of inactivity on tracking ability, and to resolve any differences in tracking for monocular vs. binocular vision. Tests using velocity- direct and acceleration-velocity-direct settings were used so that any differences in the two could be de- tected. It was noticed that for different speeds the experienced subjects tested approached the horizontal portion of their learning curves much sooner than did the novices, which indicated that inactivity reduced their operating skill perceptibility.

DISTRIBUTION: Copies of this report obtainable from Air Documents Division; Attn: MCIDXD DIVISION: Ordnance and Armament (22) SECTION: Fire Control (4)

ATI SHEET NO.: R-22-4-25

SUBJECT HEADINGS: Fire control, AA - Training equipment (36852.9)

Air Document! Dlvlilan, Intolliaanca Department Air Material Command

AIR TECHNICAL INDEX Wright-Pottarion Air Force Bam Dayton, Ohio