Back Matter Source: The Scientific Monthly, Vol. 29, No. 5 (Nov., 1929), pp. ix-xvi Published by: American Association for the Advancement of Science Stable URL: http://www.jstor.org/stable/14701 . Accessed: 08/05/2014 07:43 Your use of the JSTOR archive indicates your acceptance of the Terms & Conditions of Use, available at . http://www.jstor.org/page/info/about/policies/terms.jsp . JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact [email protected]. . American Association for the Advancement of Science is collaborating with JSTOR to digitize, preserve and extend access to The Scientific Monthly. http://www.jstor.org This content downloaded from 169.229.32.137 on Thu, 8 May 2014 07:43:38 AM All use subject to JSTOR Terms and Conditions
Transcript
Back MatterSource: The Scientific Monthly, Vol. 29, No. 5 (Nov., 1929), pp. ix-xviPublished by: American Association for the Advancement of ScienceStable URL: http://www.jstor.org/stable/14701 .
Accessed: 08/05/2014 07:43
Your use of the JSTOR archive indicates your acceptance of the Terms & Conditions of Use, available at .http://www.jstor.org/page/info/about/policies/terms.jsp
.JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range ofcontent in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new formsof scholarship. For more information about JSTOR, please contact [email protected].
.
American Association for the Advancement of Science is collaborating with JSTOR to digitize, preserve andextend access to The Scientific Monthly.
http://www.jstor.org
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Of metal construction throughout including plate holder. All parts rigidly mounted on a cast-iron base, extending entire length of instru- ment. Optical parts mounted with facilities for adjustment. Fitted with removable automatic photographic shutter. Finished in dull smooth alcohol-proof enamel.
Optical System Made of crystalline quartz of the finest quality.
COLLIMATOR LENS. Of a single piece of quartz. Focal length 610 mm for 5893A. Diameter 50 mm.
CAMERA LENS. A doublet-focal length 610 mm for 5893X. Diameter 50 mm.
PRISM. Of Cornu type, size 65 x 40 mm face.
THE SLIT. Bilateral with jaws of nonoxidizing material, micrometer drum reading to 0.01 mm slit width.
PLATE HOLDER. Of aluminum casting with metal dark slide and back cover. Alovable vertically by hand wheel for multiple exposures.
WAVE LENGTH SCALE. Graduated from 2100A to 7000A, adjustable for internal position. Fitted with lamp and switch for exposure.
PLATE. Standard 10" x 4".
Catalog Number 2820-$1475.00 net.
Write for detailed information.
Bausch & Lomb Optical Co. 633 St. Paul St., Rochester, N. Y.
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2351-13/4" Open nickel case, enamel dial with hand registering up to 12 miles.
Price $5.00 2352,-13A" Open nickel case, enamel dial with two hands; the larger hand reg- istering up to 10 miles, the rsmaller hand registering
/ ~~each 10 miles on a 100-mile dial. Price $5.50 2353-13/4" Open nickel case, enamel dial with three
A.hands. The larger central so hand registers every 80 M t yards up to one mile, the smaller hand at the right every mile up to 10 miles, and the oBae on the lef t every 10 miles up to 100.
2352 Price $6.00 2353
P*AL COMPANY Apparatus for Industrial and Laboratory Use
I53 West 23d Street New York, N. Y.
The Tapley Brake-Testitng Meter IT is the true measurement of the braking ability when the car is on the highway that
is vital to Public Safety. One cannot judge the stopping distance with any reliability, special measuring
equipment is essential. Why? Because the result is dependent upon the accuracy of a
speedometer, and as the stopping distance varies as the SQUARE 4, ~~~~~~~of the speed, the slightest inaccuracy is magnified out of propor
tion. A second difficulty is that of ensuring a perfectly level road for the test, an obvious necessity. A third source of erratic re- suits is the practical impossibility of locating the exact spot at which the brake first took effect.
The seriousness of the last mentioned aise of error is easilY seen by the fact that with a car travelling at 20 miles per hour a mistake of only half a second, one way or other, in judging when the brake was applied may easily cause results to vary by 50 per cent.
These various errors apply when the car owner attempts to esti mate the stopping distance, or to actual measurement using the wheel marks on the road, or when two fixed lines across a road are unwittingly applied as a standard of test.
The Tapley meter is automatically free from these errors. The Tapley Brake Testing Mleter gives the braking ability in per
cent, and also the stopping distance in feet as if the car were travel- ling at exactly 20 miles per hour on level road (although this meter may be used at any speed a,bove ten, miles per hour when making tests, whether the road is level or not, with equal accuracy).
Any brake testing meter (decelerometer) should be firmly attached to the car to prevent movement and consequent error. Every test must, in fairness to the public, be free from guess-work.
Further particulars upon request. You will see these Tapley Meters in service wherever E. C. CHES WELL
E accurate Technical tests are Melrose Highlands (77~), Mass. made. U.S. A. Distributor
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PHOTO-ELECTRIC CELLS FINE SHELLS I have in stock without question the largest THE CE 1a z < I LL assortment of fine shells in this country, all
properly classified. Will furnish collectionb of any size up to 20,000 species at moderate
Without Fatigue-Highly Sensitive-Absolutely prices. Correspondence solicited. Will re- Reproducible--Instantaneous in Response classify old collections, bring them up to date,
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and should not be confused with any other at modest rates. Have specialized in shells photo-electric cell. By a special process of for thirty years, and own complete working electrolysis, the photo-electric metal is intro-liry.Feboktoneqs. duced into a highly evacuated bulb directly library. Free booklet on request. through the glass wall of the bulb, giving photo-electric material of absolute purity. WALTER F. WEBB The superiority of the BURT-CELL is due to these features, making possible results never 202 Westminster Road Rochester, N. Y. before obtainable.
Described ihi Bulletin 271 QUARTZ CELLS-We are pleased to an- BOOKBINDING
nounce that we are manufacturing reproduci- We specialize in the binding of Scientific and ble quartz photo-cells for measurement of Medical Periodicals. Our bindings are sub-
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THE MICROSCOPE Write for Bulletin 273 By SIMON H. GAGE, of Cornell University
DR. ROBERT C. BURT Revised, Dark-field Edition (1927) now Available. The Old and the New in, Microscopy, with a special Manufacturing and Consulting Physicist chapter on Dark-Field Methods and their
327 S. Michigan Ave., Pasadena, Calif. Aostppid, $3.50
.________________________________________________ COMSTOCK PUBLISHING COMPANY, ITHACA, N. Y.
THE SCIENTIFIC MO`NTHLY as an advertising mediumr
"Your Money's Worth; A study in the waste of the consumer's dollar," by Stuart Chase and F. J.. Schlink, published in 1927 by The Macmillan Company, has quickly attained a large sale and much influence. It has been selected by the Book-of-the-Month Club as one of the twelve books of the year most worthy of general reading. Iu the final paragraph of the summary the authors write:
Never believe advertisements of competitive goods (except in scientific journals), and say so, loudly, clearly and on every possible occasion. Thus may ultimately come advertising that you can believe-copy backed by impartial scientific authority.
Earlier in the book (page 162) it is said: For advertising which really informs and so fulfills a useful economic function, look
through a copy of Science or the Physical Review or The Scientific Monthly. Under instructions from the editor, the advertising department of THE SCIEN-
TIFIC MONTHLY seeks to obtain only advertisements that are useful to its readers, are worth what they cost to the advertiser, and are as reliable as the contents of the editorial pages of the journal. It may not always be desirable to reject advertisements that are offered, and statements made are not necessarily endorsed, for a certain free- dom must be allowed to signed advertisements such as an editor allows to signed com- munications. The advertising department will, however, welcome information as to any statement made in an advertisement that may appear to be incorrect or misleading.
THE SCIENCE P?RESS GRAND CENTRAL TERMINAL NEW YORK, N. Y.
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Microscope Slide Preparations Zooia 0Gop Preserved Material Zoological Groups Models and Museum Preparations Embryologi- Slides Lantern Slides cal Charts, Botanical and Zoological Botanical Life Microscopes, Microtomes and Materials Histories
A Good Book on Seashore Ecology. Ver- rill's Vineyard Sound Report. $3.00.
Prompt Guaranteed Catalogs will be sent on request Service Quality Address all correspondence to
GEeo. M. Gray, Curator
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General Supplies for the Biological Sciences Marine Biological Laboratory 84 UNION SQUARE NEW YORK CITY Woods Hole, Mass., U. S. A.
PAULIN ALTIMETERS * g * ~~~An instrument which mea-
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The Educational Review was established in 1890 by Dr. Nicholas Murray Butler, now president of Columbia University, and was edited by him for twenty-nine years. The editorship was then taken by Dr. Frank Pierrepont Graves, and after he had become New York State Commissioner of Education by William McAndrew, recently superinten- dent of the Chicago schools. The Educational Review maintained for nearly forty years the highest standards, having been, as Joy Morgan, editor of the Journal of the National Education Association, remarked "the Atlantic Monthly of the educational group." The magazine has now been combined with SCHOOL AND SOCIETY, Mr. McAndrew con- tinuing as editor of the Educational Review section. Previously The School Journal, established in 1874, and The Teachers Magazine, established in 1878, had been merged in SCHOOL AND SOCIETY. It it hoped that the interests of education will be best served by the weekly publication of a single journal having the united support of all students of education.
SCHOOL AND SOCIETY, established in 1915 by J. McKeen Cattell, then pro- fessor in Columbia University and the Teachers College, and since edited by him, has maintained distinction in form, in objects and in contents. It is a weekly journal, attractive in typography and in appearance. The frequent publication permits prompt- ness in the printing of articles and timeliness in the news; it gives continuity to educa- tional interest. The scope of the journal, as its name indicates, is broad, covering the whole field of education and its relations to the social order. It encourages discussion of all problems from every point of view; it pays special attention to foreign affairs; it publishes accounts of educational events of the past week and research on fundamental problems. The contributors have included the leaders of education in America.
A journal such as SCHOOL AND SOCIETY promotes educational progress and maintains the standards of the profession. It aims to preserve the unity of education from the nursery school and before to the university and after, and to keep the educa- tional system in touch with modern democratic civilization. It is in the interest of education that SCHOOL AND SOCIETY be in every educational and public library and that it be read by those in control on the boards of schools and institutions and by the more intelligent part of the general public on whom in the last resort education in a democracy is dependent. It is even more desirable that all teachers have access to a journal the reading of which is the equivalent of a liberal professional education.
$5.00 A YEAR PUBLISHED WEEKLY 15 CENTS A COPY
THE SCIENCE PRESS
GRAND CENTRAL TERMINAL, NEW YORK
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Explorers, Scientists, Engineers, Hunters and Travelers
We have The only Equipped house
many in the Expedi- U. so tions where From every
the Poles item to the may be Equator ~~~~~~~~~obtained
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We have recently equipped two expeditions for Greenland, one for Persia and others for Venezuela, Peru, Bolivia, and Brazil. Some of these exploring parties we equipped with practically everything they needed from engineering instruments to rifles, ammunition and food. Our tents, made of Equatorial Waterproof Cloth, have stood the sun of the tropics and the freezing blasts of the Polar regions.
Let us furnish estimates-write us your wants.
Catalogs and Testimonial Letters on request
ANTHONY FIALA 25 WARREN STREET NEW YORK CITY
" Look for the sign of *le Polar Bear "
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aIN the golf course, with daylight all around ?him, a man is cheerful and calm. His psy- chological well-being helps him play his best game.
For the orderly and efficient dispatch of his daily business he should be in equally good form. Yet frequently he is handicapped by in- adequate or incorrect lighting. For no one can work cheerfully or efficiently when he is handi- capped by eyestrain, headaches and brain fatigue.
Offices of the Scientific American, New York City. Celestialite is a lighting glassware that reduces Illumination by CELESTIALITE.
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chapter of a new illustrated 24-page booklet [3] A layer of blue 2 "Out of the Darkness", which we shall be glad plearfsecto thelightn and to send you (together with a fragment of Celes- The result is a soft tialite glass) upon receipt of coupon below. white light that safe-
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IL ][]L_{]t 11 - a TIALITE showing itsthree-layerconstruction.
(Registered and Patented) Name
Position.-------- ------------------ NEXT TO DAYLIGHT Address - - _- -
ist v--------- - - -
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The Advanced Research Model ultra-violet lamp provides for pre- cision work the Quartz Mercury
~~\~~~~4~~ ~~~ Vapor Arc, long recognized as the richest available source of
ultra-violet
VIOLET RAY has developed into a valuable instrument for Ilaboratory research.
Laboratory workers are finding that Hanovia Ultra-violet Lamps are particularly dependable The accurate construction HA1N O V IA of these lamps assures you of obtaining the proper quantity and quality of ultra-violet rays to make your work successful. tILTRA.VIOLET
Consult the Director of the Hanovia Laboratory by writing him today. He will be glad to advise you of the many ways in L A II PS which the use of ultra-violet ray can assist you, and will send you information on the popular Universal Laboratory Model.
Hanovia Chemical & Mfg. Company, Chestnut St. & N. J. R. R. Ave., Newark, N. J., Dept. J-18.
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UN'ILFORM results in any process of ten depend upon absolute Umaintenance of a definite, degree of acidity or alkalinity.
Hydrogen Ion (pH) Control is an aecurate, but very practical, seientific method for standardizing the conditions neeessary to The LaMOTTE Roulette Comparator obtain these uniform results. The Roulette Comparator, illus-
Litmus tests and other antiquated and inaeeurate test methods trated above, is one of many LaMotte outfits for the proper application of
are practieally useless f or such work. LaMotte Hydrogen Ion accurate pH Control. In this equip- Determination is the only control method which eliminates guess ment LaMotte Permanent Color Standards are contained in a revolv- work. And it is as logical as taking temperature with a ther- ing drum and are always in- place, mometer! permitting immediate pH determina-
tions, with simplicity, and minimum
pH Control has already been adopted by many industries. Its danger of breakage. The set is
future applications are practically unlimited, both to industry and light socket. Highly recommended to research. for research and general control work.
Whatever the desired control there is some way that LaMotte Complete..F. 0. B. Baltimore..$60.00 pH Equipment can help you achieve greater accuracy and econ- LaMotte Chemical DC omy. We have prepared an illustrated book, "The A B C of Products Company,
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