+ All Categories
Home > Documents > Back Matter

Back Matter

Date post: 08-Jan-2017
Category:
Upload: lambao
View: 219 times
Download: 0 times
Share this document with a friend
11
Back Matter Source: The Scientific Monthly, Vol. 27, No. 3 (Sep., 1928), pp. ix-xvi Published by: American Association for the Advancement of Science Stable URL: http://www.jstor.org/stable/7988 . Accessed: 02/05/2014 10:50 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 130.132.123.28 on Fri, 2 May 2014 10:50:56 AM All use subject to JSTOR Terms and Conditions
Transcript
Page 1: Back Matter

Back MatterSource: The Scientific Monthly, Vol. 27, No. 3 (Sep., 1928), pp. ix-xviPublished by: American Association for the Advancement of ScienceStable URL: http://www.jstor.org/stable/7988 .

Accessed: 02/05/2014 10:50

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

This content downloaded from 130.132.123.28 on Fri, 2 May 2014 10:50:56 AMAll use subject to JSTOR Terms and Conditions

Page 2: Back Matter

THE SCIENTIFIC MONTHLY-ADVERTISEMENTS ix

cANNOUNCEMENT A Scientific and Educational Book Service

THE SCIENCE PRESS DISTRIBUTING COMPANY is prepared to supply any book or any- journal published in any country at as low a cost as it can be obtained. It will also supply mono- graphs, reprints and extracted articles as far as these are available. This agency has been estab- lished for the convenience of men and women working in science and education and for institutional libraries. It is particularly concerned with books, journals and reprints in science and education where we can offer unexcelled service. Orders for other publications, however, will also be filled. In- quiries and orders may be addressed to: The Science Press Distributing Company, Grand Central Ter-- minal, New York City.

BOOKS PUBLISHED IN I928

(All Books Listed are Bound Unless Otherwise Mentioned)

MATHEMATICS

An account of the principles of measuremen and calculation. NORMAN ROBERT CAMPBELL 302 pp. $5.00.

An introduction to linear difference equationE PAUL M. BATCHELDER. 215 pp. $4.00.

Ausfiihrliches Lehrbuch der analytischen ode h6heren Geometrie zum Selbstunterricht. H. I LUBSEN. Seventeenth edition by A. DONADT. 29 pp. 129 figures. $1.65.

Le Calcul techeometrique simplifie. SANFELIC: 264 pp. Paper bound. $4.00.

Contributions a l'etude du coefficient de deforma tion des fonctions non sinusoidales. Applica tions d'une nouvelle methode. E. ABASON 125 pp. Paper bound. $1.10.

Cours de, geometrie. PIERRE ClIENEVIER. $1.5(

Essais sur l'histoire de la balistique. P. CHAR BONNIER. 334 pp. Paper bound. $2.50.

Ftinfstellige Tafeln der Kreis und Hyperbelfunk tionen sowie der Funktionen ex und e-x mit de: natuirlichen Zahlen als Argument. K. HAYASH] 182 pp. Reprint. Paper bound. $2.25.

Grundzuige der darstellenden Geometric. ERICI SALKOWSKI. 100 pp. 134 illustrations. $1.65.

Grundzuige der theoretischen Logik. D. HILBER and W. ACKERMANN. 120 pp. (Die Grundlehre: d. mathemat. Wissenschaften. Volume 27. $2.20.

Methodes et theories pour la resolution de problemes de constructions geometriques ave, application et plus de 400 problemes. PETERSEN 116 pp. Paper bound. $1.00.

Vorlesungen uber die nicht-euklidische Geome trie. FELIX KLEIN. Edited by W. ROSEMANN 326 pp. 237 illustrations. (Die Grundlehren de: mathem. Wissenschaften. Volume 26.) $4.90.

Vorlesungen iiber Vektor-Rechnung. MA. LAGALLY. 358 pp. 77 figures. $5.50.

ASTRONOMY-METEOROLOGY

Azimut-Tabellen enth. d. wahren Richtgn dv. Sonne, d. Mondes u. a. Gestirne, deren Declina- tion 290 Nord oder Siid nicht iiberschreitet, f. Intervalle von 10 Zeitminuten zwischen dF Breitenparallellen von 00 bis 300 Nord oder Suid berechnet. Durchsicht u. Gebrauchsanweisg f. d. Taf. von Johs. Muller. Seventh edition. JULIUS EBSEN. 124 pp. $3.75.

Die Entwicklung des WeltaUs aus mechanischen Grundlagen. LUDWIG ZEHNDER. 71 pp. Paper bound. $.90.

Sterne und Atome. A. S. EDDINGTON. Mit. Erg. d. Autors ins Deutsche uibertr. VON 0. F. BOLL- NOW. 124 pp. 11 illustrations. $1.70.

Das Zodiakallicht. FRIEDRICH SCHMID. 132 pp. Illustrated. (Probleme d. kosmischen Physik. 11.) $2.85.

Manual of meteorology. NAPIER SHAW and ELAINE AUSTIN. Volume II. Comparative mete- orology. 484 pp. Illustrated. $12.00.

Bericht uiber die Tatigkeit des Preussischen meteorologischen Instituts in Jahre 1927. (Ver- offentlichungen d. Preuss. meteorolog. Institutsv. Nr. 355.) 211 pp. Paper bound. $3.25.

Cyclones. RONDELEUX. 102 pp. Paper bound. $1.20.

PHYSICS

Short history of physics. H. BUCKLEY. 263 ppe. $3.00.

Sir Isaac Newton. Edited by F. E. BRASCH. 340 pp. $5.00.

Einftihrung in die allgemeine Mechanik. MAX- PLANCK. Fourth edition. 226 pp. 43 illustra- tions. $2.00.

Principles of mechanism. F. DYSON. 304 pp.. $4.25.

Elements of optics. JOSEPH VALASEK. 215 pp.. Illustrated. $2.00.

This content downloaded from 130.132.123.28 on Fri, 2 May 2014 10:50:56 AMAll use subject to JSTOR Terms and Conditions

Page 3: Back Matter

x THE SCIENTIFIC MONTHLY-ADVERTISEMENTS

BOOKS PUBLISHED IN I928

PHYSICS-Continued

Das Mikroskop. Ein Leitfaden der wissen- schaftlichen Mikroskopie. PAUL METZNER. 509 pp. 372 illustrations. About $10.00.

Tables of physical constants, and some mathe- matical functions. GEORGE W. C. KAYE and THOMAS H. LABY. 6th edition. 163 pp. $4.75.

Handbuch der Physik. Edited by H. GEIGER and K. SCHEEL. Volume III: Mathemat. Hilfsmittel in d. Physik. 647 pp. 138 illustrations. $14.90.

Grundriss der Physik fur Studierende, besonders fiir Mediziner und Pharmazeuten. WALTER GUTTMANN. 22nd edition revised by W. VAHLE. 224 pp. 208 illustrations. $1.90.

Laboratory manual of experiments in physics. LEONARD R. INGERSOLL. Second edition. 220 pp. Illustrated. $2.25.

Physics for college students; an introduction to the study of the physical sciences. A. A. KNOWLTON. 641 pp. Illustrated. $3.75.

Elements of physics. ALEXAND W. DUFF and HENRY T. WEED. 574 pp. Illustrated. $2.20.

An outline of physics. A. E. CASWELL. 787 pp. Illustrated. $4.25.

Einfiihrung in die theoretische Physik. MAX PLANCK. Volume III: Einfuihrg in d. Theorie d. Elektrizitiit u. d. Magnetismus. 206 pp. $2.00.

Lectures on theoretical physics, delivered at the University of Leiden: H. A. LORENTZ. Volume II. 410 pp. $7.00.

Operational methods in mathematical physics. (Cambridge tracts in mathematics and mathe- matical physics, no. 23.) H. JEFFREYS. 99 pp. $2.25.

Die Ausbreitung der elektromagnetischen Wel- len. Ein Bericht uber d. Literatur d. Gebietes. ALFRED SACKLOWSKI. 129 pp. $1.50.

The electrical conductivity of the atmosphere and its causes. VICTOR F. HESS. 214 pp. Illus- trated. $4.00.

Mathematische Stromungslehre. W I L H E L M MtULLER. 239 pp. 137 illustrations. $4.90.

Theorie der zusammengesetzten Waagen. JULIUS ZINGLER. 203 pp. 53 illustrations. $3.75.

Materiewellen und Quantenmechanik. Eine element. Einfiihrg auf Grund d. Theorien de Broglies, Schrodingers u. Heisenbergs. A. HAAS. 160 pp. $1.90.

The New Quantum Mechanics. GEORGE BirT- WISTLE. 290 pp. $5.50.

PHYSICS-Continued

Behandlung von Schwingungsaufgaben mit komplexen Amplituden und mit Vektoren. 128 pp. 91 illustrations. 1 plate. $2.00.

Phosphorescenz und Fluoreszenz. Part I. P. LENARD, FERD. SCHMIDT and ZR. TOMASCHEK. 741 pp. 162 illustrations. (Handbuch der Experi- mnen1talphysik.) $17.75.

Atomstruktur u. Atombindung. JOHANNES STARK. 198 pp. 15 illustrations. 1 plate. Paper bound. $2.25.

Matter, electricity, energy. W. GERLACH and F. J. FUCHS. 442 pp. Illustrated. $6.00.

Lehrbuch der Elektrodynamik. I. FRENKEL. Volume II: Makroskopische Elektrodynamik der materiellen Korper. 505 pp. 50 illustrations. $11.55.

Die physikalischen Grrundlagen der elektrischen Festigkeitslehre. N. SEMENOFF and ALEXANDER WALTHER. 168 pp. 116 illustrations. $4.15.

AERONAUTICS

Sur l'aerodynamique des ailes, sustentatrices et des h6lices. MAURICE :Roy. 194 pp. Paper bound. $1.50.

Die Moglichkeit der W'eltraumfahrt. Allgemein- verst. Beitrige zum Rauwschiffahrtsproblem voN HERMANN OBERTH, FRANZ V. HOEFFT, WALTER HOHMANN. Edited by WILLY LEY. 344 pp. 70 illustrations. $3.75.

Beginning to fly; the book of model airplanes; introd. by Conunander Richard E. Byrd. MER- RILL HAMBURG. 211 pp. Illustrated. $2.50.

Building and flying model aircraft. PAUL EDWARD GARBER. 300 pp. Illustrated. $2.25.

ENGINEERING

Engineers. A directory of engineers, representing the executive buying staffs of corporations. 1600 pp. $25.00.

Siemens,Jahrbuch. Edited by Siemens & Halske and Siemens-Schuckertwerken. Volume I, 1927. 472 pp. Illustrated. $3.00.

Die Elektrizitiat und ihre Anwendungen. L. GRAETZ. 23. revised edition. 818 pp. 739 illus- trations. $4.15.

Lecons d ' electrotechnique g6n6rale. P A U L JANET. Volume III. 414 pp. Paper bound. $4.00.

Cours d 'lectrotechnique. Livre IV. Generateurs et Moteurs a courants alternatifs. ILIOVICI. 368 pp. Paper bound. $1.20.

This content downloaded from 130.132.123.28 on Fri, 2 May 2014 10:50:56 AMAll use subject to JSTOR Terms and Conditions

Page 4: Back Matter

THE SCIENTIFIC MONTHLY-ADVERTISEMENTS

R(C)KT PTTIT_TSHED TMN TQa2

ENGINEERING-Continued

Transformateurs et Moteurs d 'induction. C. CILEMENT. 348 pp. $2.76.

Arbeiten aus dem Elektrotechnischen Institut der Technischen Hochschule Aachen. Volume II. 202 pp. Paper bound. $3.00.

Hilfsbuch fur die Elektrotechnik. Edited by KARL STRECKER. Tenth revised edition. 1137 pp. 1057 illustrations. $10.50.

Protection contre les effets nuisibles de 1'elec- tricite. NERVILLE and HARDY. 860 pp. 232 illustrations. $5.48.

Die synchronen Wechselstrommaschinen. JULIUS KOLLERT. 247 pp. Illustrated. $3.65.

Die Transformatoren. Theorie, Aufbau u. 3erechnung. Ein Handbuch f. Studierende u. Praktiker. RUDOLF WOTRUBA and ADALBERT STIFTER. 203 pp. 102 illustrations. $3.00.

Isolateurs en porcelaine. GUSTAV BENISCHKE. 151 pp. $1.60.

A text book of telegraphy, theoretical and prac- tical. A. E. STONE. 462 pp. $6.50.

Elektrische Messtechnik. WILIRELM JAEGER. Third revised edition. 553 pp. 556 illustrations. $10.75.

ENGINEERING-Continued

Die Technik elektrischer MessgeraLte. GEORG KEINATH. Third revised edition. Vol. I. Mess- geriite und Zubeh6r. 612 pp. 561 figures. $8.75.

Transmission line engineering; all data neces- sary for a thorough study of the transmission line problem from the electrial standpoint. W. W. LEWIS. 361 pp. Illustrated. $4.00.

Induction motor practice. A. M. DUDLEY. 236 pp. Illustrated. $2.50.

Elektrische Vollbahnlokomotiven. KARL SACHS. 461 pp. 448 illustration1s. 22 plates. $21.

Storage batteries simplified. VICTOR WILFRED PAGI. New enlarged edition. 258 pp. Illus- trated. $2.00.

Power's practical refrigeration. L. H. MoRRi- SON. Second edition. 259 pp. Illustrated. $2.50.

BOOKBINDING

We specialize in the binding of Scientific and Medical Periodicals. Our bindings are sub- stantial; our work prompt, and our prices low.

LAUNDER BOOKBINDERY (Established 1882)

157-159 East Thirty-Second Street, New York, N. Y.

Publishers: G. E. STECHERT CO., New York-DAVID NUTT, London-FELIX ALCAN, Paris- Akad, Verlagsgesellschaft, Leipzig-NICOLA ZANICHIELLI, Bologna-RUIZ HERMANOS,

Madrid--RENASCENCA PORITUGUESA, Porto-THE MIARUZEN COMPANY, Tokyo

"SCIENTIA" INTERNATIONAL REVIEW OF SCIENTIFIC SYNTHESIS

Published every month (each number containing 100 to 120 pages) Editor: EUGENIO RIGNANO

IS THE ONLY REVIEW the contributors to which are really international. IS THE ONLY REVIEW that has a really world-wide circulation. IS THE ONLY REVIEW of scientific synthesis and unification that deals with the funda-

mental questions of all sciences: the history of the, sciences, mathematics, astronomy, geol- ogy, physics, chemistry, biology, psychology and sociology.

IS THE ONLY REVIEW that by means of enquiries among the most' eminent scientists and authors of all countries (On the philosophical principles of the various sciences; On the most fundamental astronomical and physical questions of current interest, and in particular on relativity; On the contribution that the different countries have given to the development of various branches of knowledge; On the more important biological questions, and in par- timclar on vitaltsm; On the social question; On the great international questions raised by the World War), studies all the main problems discussed in intellectual circles all over the world, and represents at the same time the first attempt at an international organization of philosophical and scientific progress.

IS THE ONLY REVIEW that among its contributors can boast of the most illustrious men of science in the whole world. A list of more than 350 of these is given in each number.

The articles are published in the language of their authors, and every number has a supplement containing the French translation of all the articles that are not French. The review is thus completely accessible to those who know only French. (Write for a free copy to the General Secretary of " Scientia, " Milan, sending 12 cents in stamps of your country, merely to cover packing and postage.)

SUBSCRIPTION: $10.00, Post free Oflice: Via A. De Togni 12, Milan 116 General Secretary: DR. PAOLO BONETTI.

This content downloaded from 130.132.123.28 on Fri, 2 May 2014 10:50:56 AMAll use subject to JSTOR Terms and Conditions

Page 5: Back Matter

xii THE SCIENTIFIC MONTHLY-ADVERTISEMENTS

H AN OV71IAA Rthe field of ul-t U TRAVIOLET

traviolet research has LA M PS resulted in a wide demand for current information on the laboratory application of ultraviolet.

To assist in meeting this demand the HANOVIA Laboratory invites specific in- quiries addressed to its Director.

ThroughBulletin3B general information is available on the Universal Laboratory Model . which provides, for precision work, the Quartz Met

which has long been recognized as the rich, est available source of ultraviolet.

HANOVIA CHEMICAL & MFG.

COMPANY

Chestnut St. & N. J. R. R. Avenue Newark, N. J.

NEW YORK, CHICAGO SAN FRANCISCO

Key J_4

This content downloaded from 130.132.123.28 on Fri, 2 May 2014 10:50:56 AMAll use subject to JSTOR Terms and Conditions

Page 6: Back Matter

THE SCIENTIFIC MONTHLY-ADVERTISEMENTS xiii p~~ i

The aTple

IN4e;ter ' "

.~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~4; J.0, t oi,, ,..

One scale is calibrated in stopping distance in feet as f rom a speed of 20 miles per hour on level road. Tbe other scale gives the per cent grade brake holding ability, which is independent of speed, and shows what percentage braking ability the motor vehicle has compared to the maximum possible.

The Tapley meter may be used whether the motor vehicle is on level road or nht, and at any speed above io miles per hour, with an average error within ie% A Cer- tificate of Test is furnished with each instrument.

This is a remarkable achievement taking into consideration the different factors involved; suceh as, the fact that the stopping distance depends upon the square of the speed, whether the vehicle is on an up or down grade, and the braking effect not being constant throughout the period the brakes are applied.

Long life with continued accuracy is fundamental to the Tapley Meter. Brakes can be equally adjusted in the garage, but the braking ability of the vehicle on the road is what the Official is interested in, and what Public Safety' depends upon. A Car, Truck, or Bus that has braking ability to stop in 45 feet from a speed of 20 miles per hour on level road (the usual general safe minimum standard) will not stop in less than 100 feet when going 80 miles per hour, or in less than 178 feet at 40 miles, or in less than 402 feet when travelling at 60 miles per hour. These stopping distances are increased when on a down grade, which shows conclusively that there is little or no control of a car at high speeds: a very impor- tant factor for consideration before increasing speed limits on the Public Highways.

The Tapley Brake Testing Meter is fur- nished with a scale holding device so that the personal error in catching the meter reading is eliminated. Also, a universal fitting is fur-0 nished for firmly attaching this meter to any suitable part of the car, preferably the running board, as illustrated, or with a quick acting cam clamp if desired.

Further details upon request

E. C. CHESWELL Tapley Brake--Testing Meter Melrose Highlands (77), Mass. Attached to Running Board

U. S. A. Distributor for Messrs. Tapley & Company, Totton, Southampton, England Pacific Coast Distributors: Gillespie Sons, 220 First St., San Francisco, and 939 West 12th St.,

Los Angeles. Canadian Distributor: L. B. Coombs, 66 Millwood Road, Toronto, Ontario.

This content downloaded from 130.132.123.28 on Fri, 2 May 2014 10:50:56 AMAll use subject to JSTOR Terms and Conditions

Page 7: Back Matter

xiv THE SCIENTIFIC MONTHLY-ADVERTISEMENTS

"Lighter, smaller in bulk and plenty warm-in fact the warmest I have ever slept up ifc l y c there in Western Q-uebec. The Eiderdown robes were there also, but I would not trade your bag for any of them-its the best one I've ever seen" (Dr. G. M. Hays). That's what they all say of

AAial PAItNT SLtEPING BAGS

The only scientifically correct bag made; no hooks or fasteners; the bag used by Explorers, Engi-4~!N w Y r ' neers and Campers ............ 25N ew York's MAirakcel. Pocket Binoculars-New 7-Power, 6 oz., high-grade Prism. $85 N w s o e Hensoidt New I'Dialyt"9-6 x 30.. $58 Zeiss Wide-Angle "1Deltrentis "

Prismiris Pocket Binoeular-6X genuine prism; 16 12 oz.; splendid glass for little money .......... , V tic Sports and Engineers Compass-Luminous Dial. $3.50 d i

C-anoe Sponsons-Portable and adjustable, makes b 10 your canoe safe, per pair ....................... $10 X f 1 11t Flash Light-no batteries: 8" long; complete elee-

tric-light plant; runs continuously; guaranteed, $10 227 WVst 45th St. Scientific, Explorizg, Camping Outfits-Write for

Catalog "A" At Broadway

ANTHONY FIALA OUTFITS New York 25 Warren St. Just off City Hall Park New York City

A N4ew lIotel Adjacent to every Activity e1 661'~ 7 ~600 Bright Sunlit Rooms XVitnout LJ)S Each with Bath, Elec-

IT'S NEVER BEEN DONE BEFOREI tric Fan, Ice Water.

- One Price for All the Rooms! - Single Room & Bath $3.00

HE 12-story fireproof Cornish Arms - Double Room & Bath $4.50 T1 Hotel, just opened, has eliminated all the hokum of " up " prices. This convenient and comfortable new hotel has Exceptional Restaurant only one price for a single room and and Luncheonette bath, $30oo per day. Double rooms for two, with bath, $4.50. Remember, there are no ups." There's a bath with every Wire at our Expense room. 340 rooms to select from. Excel - for Reservations lent restaurant service at moderate prices.

5 amninutes to Timnes Square, 5 minutes to | -

Penn. Station, 8 minutes to Grand Central, and near all Steamuship Lines.

F. D. Sofield, COME AND COMPARE' Managing

- i ~~~~~~Director Cornish Arms Hotel West 23d Street, at Eighth Avenue

NEW YORK - W

~~~~~~~~~~~~~~~~~~~~~~~5

This content downloaded from 130.132.123.28 on Fri, 2 May 2014 10:50:56 AMAll use subject to JSTOR Terms and Conditions

Page 8: Back Matter

THE SCIENTIFIC MONTHLY-ADVERTISEMENTS xv

BIO)LOGCxICAAkL S UPPLIES FOR THE

SUPPLY Biological Sciences DEPARTMENT Preparations for the Open the Entire classroom museum, or Naturalists' Supplies

Year collector Microscope Slide Preparations .qS,5T?> VP !Preserved Material

The sign of the Limulus Models and Museum Preparations is a guarantee. Lantern Slides

Charts, Botanical and Zoological Now is a good time to Microscopes, Microtomes and Now iS a good time to Accessories

5 " I place your orders for Dissecting Instruments fall delivery. Then you Laboratory. Glassware can enjoy your vaca- Chemicals tion knowing that your Bacteriological Reagents orders will be cared for.

Catalogs: No. I, Zoological Material Prompt Guaranteed No. II, Botanical Material Service Quality No. III, Microscopic Slides

Write us about unlisted material Address all correspondence to: New York Biological Supply Co.

GEO. M. GRAY, Curator General Supplies for the Biological Sciences

THE MARINE BIOLOGICAL LABORATORY T UNION SQUARE NEW YORK CITY Woods Hole, Massachusetts _

SPECIAL SALE OF TAMI POCKET MICROSCOPES Widely used for botany, entomology, min-

eralogy. biology, chemistry, geology and other general microscopic work. The objective is divisible. With the bottom objective lens (F) G

removed, the magnification ranges from 25x to 112x, whereas with bottoni lens attached mag- nifications range from 50x to 225x. The varia- tion in magnifications is obtained by extending or collapsing the telescopic draw tubes.

Fine focusing is accomplished by turning the knurled collar (E).

Microscopic slides or other transparent ob- jects are placed on the stage (A) for examina- tion while larger and opaque objects are ex- FA amined by removing the base (D) and placing cB the microscope directly over or onl the object. Supplied with metal case 4 x i3/4 inches. D

Taiiia i uuc,*et >icroscope List Price .................... $20.00 Tami extended, show- Taiiii jcock-et *Aicroseope ~~~~~~~ing m-agnifications call-

with base removed to ex- brated on the draw amine opaque objects. SPECIAL SALE PRICE $I6.oo tubes.

PAW COMPANY APPARATUS FOR INDUSTRIAL AND LABORATORY USE

I53 WEST 23rd STREET NEW YORK, N. Y.

This content downloaded from 130.132.123.28 on Fri, 2 May 2014 10:50:56 AMAll use subject to JSTOR Terms and Conditions

Page 9: Back Matter

xvi THE SCIENTIFIC MONTHLY-ADVERTISEMENTS

Any Negative can be enlarged to 12 x 18 inches

rov ~~~~It uses Standard | 0

Cinema Film

"The Universal Camera"

IDEAL VACATION CAMEPRA SMALL SIZE:

It measures 5 3/16 x 2 3/16 x 1 3/16 in.

LIGHT WEIGHT: 15 oz. only.

Inexpenssive to operate: A Hundred _ compared with a standard Exposures for 50 Cents.

pair of binoculars 6 x 30 mm.

Independent of Light Conditions: Due to fast Lens and Shutter o Vast Range of Speed.

Easiest Camera to Operate: In winding the Shutter, the Film is auto- matically transported and thereby Double Exposure is impossible.

Enlargements up to 12 x 18 in.: Are easily made and reveal Sur- prising Perspective and Natural Proportions without Disturbing Grain Effect.

Is the Smallest Roll Film Camera with Focal Plane Shutter It Actually Fits the Vest Pocket

The Ari& Camera will be included in the official equip- ment of Commander Byrd's South Pole Expedition.

E. LEITZ, INC. 60 East 10th St., New York, N. Y.

Agents for Pacific Coast States: Ask; your Dealer or Write for SPINDLER2 & SAUPFFE l

86 Third Street, San Francisco, Cal. 811 West 7th Street, Los Angeles, Cal.

This content downloaded from 130.132.123.28 on Fri, 2 May 2014 10:50:56 AMAll use subject to JSTOR Terms and Conditions

Page 10: Back Matter

l~~~~lS

PRISM BINOCULARS

IN ADDITION to their well- scopic Magnifier has a much known qualities as field larger field of view and greater

glasses Zeiss Prism Binoculars working distance than anastig- of small and medium power can matic and aplanatic magnifiers. be focussed on objects as close -Thus, a Zeiss Binocular will as 6 ft. With the aid of inter- serve scientists and nature stu- changeable supplementary front dents as an exceptional Field lenses magnifications up to 30x Glass as well as a Magnifier. may be obtained. Such a Tele- Write for detailed literature-ig.

CARL ZEISS, INC. 485-R Fifth Ave., New York

Pacific Coast Branch: 728 South Hill Street, Los Angeles, Calif.

l ._._ ,!I

This content downloaded from 130.132.123.28 on Fri, 2 May 2014 10:50:56 AMAll use subject to JSTOR Terms and Conditions

Page 11: Back Matter

You'll find this book of real help in your work

"The A B C of Hydrogen Ion Con- trol" is a thoroughly practical book that covers the subject in a clear and comprehensive way and is filled wNith helpful information. It contains a full explanation of the method, lots of

^ 13 1 The AB C |l I i valuable data on its application in e 1l 1 of 9 many branches of science and in-

lydrogen Ion dustry, and detailed information on control the materials and equipment used.

If you have not obtained your com- e. 1 plimentary copy, write for it to-day.

It will be sent gladly on request.

LaMotte Chemical Products Co., 422 Light St., Baltimore, Md., U. S. A.

Laboratory Apparatus and Supplies

PARIS PAN-AMRICAN EXPOSITION: EXPOSITION:

Eight Awards and Medals Gold Medal

Our General Laboratory and Museum Supplies include:

Scientific Apparatus and Instruments, Chemicals, Anatomical Models, Osteological Preparations, Natural History Specimens and Preparations, Wall Charts, Mu-

seum and Naturalists' Supplies, Glass Jars, Microscopes and Accessories.

Museum Cabinets (Yale Style) Biological and General Laboratory Supplies

THE KNY-SCHEERER CORPORATION OF AMERICA Dept. of Natural Science, IO-I4 West 25th Street

G. Lagai, Ph.D. New York City

This content downloaded from 130.132.123.28 on Fri, 2 May 2014 10:50:56 AMAll use subject to JSTOR Terms and Conditions


Recommended