physiological apparatus - science inductorium magnetic signals respiration pump parts andaccessories...

MARCH 23, 1945 SCIENCE-ADVERTISEMENTS 9

PHYSIOLOGICAL APPARATUS

for RESEARCH and TEACHING

THE INDucToaIum-three-eighths actual size

Kymographs Recording Levers

Time Recorders Manometers

Electrodes Operating Holders

Keys and Switches Stands and Clamps

Tambours Inductorium

Magnetic Signals Respiration Pump

Parts and Accessories

Write for the Descriptive Catalogue with Price-List

The HARVARD APPARATUS COMPANY, Incorporated

Dover, Massachusetts

(Organized on a non-profit basis for the advancement ofteaching and investigation in physiology and the allied sciences)

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MARCia 23, 1945 SCIENCE-ADVERTISEMENTS 9

SCIENCE-SUPPLEMENT VOL. 101, No. 2621

SCIENCE NEWSScience Service, Washington, D. C.

TELEPHONE WIRE OVER THE GREAT

SMOKY MOUNTAINSAN airplane that looks like one used by commercial air-

lines succeeded in laying 16 miles of telephone wire over

the rough, wooded slopes of the Great Smoky Mountains

between Tennessee and North Carolina in 61 minutes, a

report from the Air Technical Service Command at

Wright Field reveals. Flying low over elevations between

1,500 and 5,000 feet, the wire was laid for use by National

Park Service rangers.

The wire-laying project was accomplished last October

by a C-47 cargo plane with the aid of the ATSC and the

Bell Telephone Laboratories. Rangers used the wire for

communication between Gatlinburg, Tenn., and Smoke-

mont, N. C., for five weeks before a sleet storm sheathing

the wire with an inch of ice caused a break." This development by the equipment laboratory of the

division and the Bell Telephone Laboratories represents

an immense saving in time, labor, money and, what is

more important, lives, " declared Brigadier General F. 0.

Carroll, chief of the engineering division of the ATSC.Setting up standard telephone poles for 16 miles over

the mountainous terrain would have required many men

and many days. Applying the method to military opera-

tions, a length of wire could be laid over an area open to

enemy artillery fire, probably without the loss of a singlelife. It is common in this war to lose many lives estab-lishing even short-distance field communications.

In operation, the present method of laying wire from

the air uses eight wooden boxes, each containing two

miles of wire. The wire is boxed and wound so that therewill be no snarls, broken wire, fraying of insulation or

other troubles. The wire in each box is spliced to thewire in the next box, so that the unit is actually one longline.From the front end of the lead box extends a long metal

tube, like the barrel of a big camera lens. To the leadend of the wire is attached a chain and a parachute,which are tossed from the plane's side door over the spot

where the wire is to be laid.Only four men, including pilot and co-pilot, are needed

to handle the 16 miles of wire in each plane. There are

no special attachments or modifications to the plane.In 1942 the idea of laying wire by airplane was pre-

sented to the National Development Research Council,which, in collaboration with the Signal Corps, began a

six-month project. Although moderately successful, theproject lay dormant until last year.

ITEMS

A HUNDRED and thirty billion units of penicillin, or

about 6,500,000 doses, are being supplied to the nation'sdrug stores, hospitals and drug supply houses. By April1, 130,000,000,000 units will be available for civilian use

by War Production Board allocation. (From 5,000 to40,000 units are needed in each injection, depending on

the illness.) This is more than three times as much as

has ever been released for an entire month by WPB 's,

civilian penicillin distribution unit in Chicago. For the

month of April, the civilian allocation will be increased

to 150,000,000,000 units. After that, monthly allocations

are expected to be increased each month.

WARNING that great care should be taken in givingblood transfusions to women with Rh negative blood who

have given birth even as much as 16 years earlier to

Rh positive babies is given in a report by Dr. Lawrence

E. Young and Dr. Donald H. Kariher, of Rochester, N. Y.,in the Journal of the American Medical Association.

Some physicians have believed that the antibodies built

up in the mother's bloodstream by the Rh positive infant.which may cause a violent reaction to transfusion with

Rh positive blood, will disappear in the course of three

or four years. "Sensitivity to the Rh factor," these

investigators report, "once it is acquired, may persistfor many years, probably for life." It is recommended

that nothing but Rh negative blood be transfused into Rh

negative patients regardless of how long it is since theygave birth to an Rh positive baby or of previous historyof transfusions.

JOHN HEARN, of the Big "O" ranch, reports that

airmen stationed at the AAF Flexible Gunnery School

at Laredo, Texas, have found that camouflage suits elimi-

nate the need for blinds or concealed spots when duck

hunting. Wearing a green and brown camouflage similar

to those worn by commandos, marine and other fightersin invasions, gunners can sit on a river bank and fire

away at ducks who even will sit down on the water a few

feet away. Their camouflage suits cause the hunters

to blend into the natural coloring of the spot they have

picked. This does away with the blinds and effectivelyhides them from the eyes of a cautious duck. Camouflagesuits can also be used to stalk deer, hunt coyote, rabbits

and other wildlife. A hunter may have a camouflage suit

to blend with every season's coloring and every type of

terrain where he may wish to hunt.

HEAvY rolling of shoe sole leather, or compression byother means, produces an improvement in wear, it is found

by recent tests made by the National Bureau of Stand-

ards, in which a regiment of soldiers in an officer candi-

date eamp were used, together with some civilian workers

in war industries. The tests showed also that differences

in the wearing quality of twenty commercial tannages of

vegetable sole leather were very small, with no significantdifference in the wear of leather tanned from domestic

and from cold-storage hides. They showed further that

water-soluble materials and grease are lost from soles

in service, the greatest loss being shown by water-soluble

ash. The so-called "rubber" abrasive machines are of

little use in predicting the wearing qualities of tannages.The wearing quality can be estimated, to a degree, by the

water-soluble content, the firmness, and the degree of

tannage.

10

MAC 394 C C-DVRi MNT 11

WILEY BOOKS ror

GENERAL PHYSICSBy OSWALD H. BLACKWOOD, Professor of Physics, University of Pittsburgh

A comprehensive textbook for the standard course in general physics for college students. Treatment is simple,yet rigor has been maintained. The absolute system of force units is used in this book rather than the gravita-tional system. The electromagnetic system replaces the International system of electrical units, and the authorintroduces as an alternative the meter-kilogram-second system. The text is amply illustrated, and is supplementedby a large number of problems, grouped according to difficulty.

630 pages; 51 by .8; 1943; $3.75

INTRODUCTORY COLLEGE PHYSICSBy OSWALD H. BLACKWOOD

Intended for a first course in the study of physics, for non-technical students. The book covers the usual groundwith a deliberately restricted and simplified vocabulary and with a great simplification of units. Emphasis is uponreason rather than upon memory. Repetition of fundamental facts and principles fixes them firmly in the student 'smind. A minimum amount of mathematics is used, particularly in the earlier part of the book.

487 pages; 6 by 9; 1939; $3.50

COLLEGE PHYSICSBy JOHN A. ELDRIDGE, Professor of Physics, State University of Iowa

This edition constitutes a thorough revision of an elementary textbook that approaches the subject from the stand-point of everyday. experience. Of special appeal to the physics major as well as to those students whose Ynajorinterest lies in other fields. Previous study of physics is not required. The subject matter is elastic, in that eithera short or long course may be based upon it, depending on curriculum requirements.

Second edition; 702 pages; 51 by 81; 1940; $3.75

GENERAL PHYSICS FOR STUDENTS OF SCIENCEBy ROBERT BRucE LINDSAY, Hazard Professor of Physics, Brown University

This textbook provides the basis for an introductory course for students of science who have had mathematicsthrough elementary calculus. This volume introduces the fundamental concepts of physics in logically rigorousstyle. Special attention is given to the presentation and definition of basic concepts, particularly in mechanics.

534 pages; 6 by 9; 1940; $3.75

PHYSICSBy.W. F. G. SWANN, Director, Bartol Research Foundation of the Franklin Institute

Here is a new approach to the elementary study of physics. The book presents the broad fundamental laws andconcepts of physics, without the technicalities. Basic principles of motion, heat, etc., are first established, thentheir applications in many diverse fields are shown. The style-is clear, interesting and scholarly.

274 pages; 5i by 81; 1941; $1.75

-JOHN WILEY & SONS, Inc., 440-4th Ave., New York 16, N. Y.

MARci 23, 1945 SCIENCE-ADVERTISEMENTS 11

12 SCIENCE-ADVERTISEMENTS VOL. 101, No. 2621

1BLAKISrON BOOKSBENSLEY

Practical Anatomy oF the RabUit-7th EditionBy B. A. BENSLEY, Ph.D., Revised by E. HORNE CRAIGE, Ph.D., University of Toronto.114 Itlus., 358 Pages. Ready Shortly (1945)

A new section on the sense organs is included, also an account of the essential structure of theliver. A number of illustrations have been changed and 24 entirely new ones added includingsome photographs of corrosion preparations. Details of description and directions for dissectionhave been carefully revised and improved. Emphasis is upon functional significance of structure.

WOLFFPathology oF the Eye-2nd EditionBy EUGENE WOLFF, M.B., BS, F.R.C.5., Ophthalmic Surgeon, Royal Northern Hospital.212 Illus., 286 Pages. $7.50 (1945)

A special study of the effects of disease as seen in the various tissues of the eye and associatedparts. The author discusses the pathology of each conditon and then gives its complications andsequelae. The volume offers a complete outline review of the subject with a profusion of illus-trations. The material is arranged according to the anatomical sites of the lesions. An adequate,up-to-date bibliography is included.

HEWERRecent Advances in Anesthesia and Analgesia-5th Edition(With * Chapter on Oxygen Therapy)By C. LANGSTON HEWER, M.B.Y B.S., D.A. (Eng.) Senior Anesthetist,St. Bartholomew's Hospital, London.141 Illus., 343 Pages. $5.50 (1944)

This new edition includes important material on anesthesia for thymectomy; general analgesiawith ethyl hlori~de and trichlorethylene; intravenous general analgesia with proaine; improvedapparatus for controlled respiration; pethidine analgesia in obstetrics; pressure infiltrators;fractional caudal block; suction from oxygen cylinders, etc. New nomenclature, a new chapteron Anesthetic Charts and Records, Military aspects of anaesthesia, 21 new illustrations are in-cluded.

CAMERONRecent Advances in Endocrinology-5th EditionBy A. T. CAMERON, M.A., D.Sc., F.R.S.C., University of Manitoba.73 Text Figures (3 Plates) 415 Pages. $5.00 (1945)

Considerable attention is given to the clinical aspects of the subject because of the abundanceof new material now available. Of special interest are the findings concerned with the inter-relationships of the actions of two or more endocrine compounds, a study of the new nomenclatureand of standardized preparations.

THE BLAKISTON COMPANY UPhiadelphia 5,


MARCH 23, 1945 SCIEATOE.ADVERTISEMENTS 13

THE CHEMICAL PROCESS INDUSTRIESBy R. NORRIS SHREVE, Purdue University. Chemical Engineering Series. *941 pages, $6.00

Present-day teaching trends in chemical engineering are into unit operations and unit processes, not only in thereflected in this important new book. Offering a defi- flow sheets, but in the supplementary text as well. Overnitely fresh approach, the author follows modern factory 100 flow sheets are included. The book covers all recentpractice in breaking down the actual industrial procedures advances in the field.

FLAVORBy ERNEST C. CROCKER, Arthur D. Little, Inc. Food Technology Series. In press-ready inApril

The first comprehensive treatment of the whole subject for developing and retaining flavor in processed foodsof flavor, including both theoretical and practical aspects and other products, as well as methods for detection, cor-of odor and taste. Contains a philosophy lof flavor, a rection, and prevention of undesirable flavors in com-description of the physiology of flavor perception, the mercial products.chemistry of flavoring agents and condiments and methods

TRANSMISSION LINES, ANTENNAS, AND WAVE GUIDESBy Members of the War Trairing Staff:'Cruft' Gradtate School of Engineering, Harvard Uni-versity. In press-ready in April

Presents, with some additions, the material given in -the

lectures on transmission lines, antennas, wave guides, andwave propagation that has been given as part og a courseof instruction in pre-radar training to Army-Navy ofefersat Cruft Laboratory, Harvard Univeroity. Transmission

lines are presented exclusively from the high frequencypoint of view; antennas from the point of view of elee-tromagnetic theory; and wave guides from the point ofview of generalized transmission circuits. There is abrief treatment of wave propagation.

ELECTROMAGNETIC ENGINEERING. Vol. I-FundamentalsBy RONOLD W. P. KiNar; Harvar~d Jivirsity. McGr4w-Hdll Radio Communications Series.In press-ready in April

The first of a series of three volumes, this book gives a The physical and mathematical essentials of electrody-systematic -introduction to those basic concepts of elWc- nhmics are logically developed and critically discussed fortromagnetism that are fundamental in the study of elec- the purpose of application to engineering problems. Alltromagnetic wgaves, antennas, electromagnelie Gowaye concepts- are introduced: id their most general form, andguides, and ultra-high-fzequency and intso6*avr eitiults. are defined systematically.

PLASTICS IN PRACTICEBy JOHN SAssO, Managing Editor, Product Engineering, and MACHAEL A. BROWN, JR., Mon-.santo ChemicJ ~ pYa4.< IIfpresealy in April

Here is a general treatment of plastic material;,Zigi~ed.- especially for the reader concerned with choice of ma-

around 103 actual uses of plastics, the majority of which terials, design, or merchandising of products. All ma-are in successful commercial production. The book repre- terials, methods of fabrication, properties, design, and

sents an entirely new approach to the subject, planned cost factors are covered.

INTRODUCTION TQ.AdICROWVAVSBy SIMON RAMO, G1enierta le ltric Company'. 142 pages,$1'5;

In this book- the author 1iesentt a etitely aonmathe.. cavities and wavef guidps, etc. The text correlates micro-matical description of the physical hasi£fo£ micro bwaves with lower frequency electricity in simple language,wave phenomena, including transit-time electionkis, velbc- with a large number of explanatory diagrams. The quali-ity modulation, radiation, transmission lnes) resonant ta-tive discussions are an outstanding feature.

Send for copies on approval

McGRAW-HILL BOOK COMPANY, INC.33 Wes 4.n Stet e ok1 . Y . A.w Hose Lono. W.C

SciglyCE...,-A'DVERTISEMENTSMAR~CH 23, 1945 13

22A,0~ Weeit-42ndStreitt, New York 18,-.N.'Y.' se, W.c.2Aldwyth Ilou' L..6bdong

14SINEAVRIEENSVL 0,N.22

EXPERIMENTAL BIOLOGY MONOGRAPHSThis important series of scientific monographs constitutes a cumu-.lative library on research in the various branches of the biologicalsciences in which substantial progress is being made. Each ofthe volumes listed below is written by an active worker, or work-ers, in its field; and presents a summary of the experimental con-tributions to that field and discusses in detail the theoretical im-plications of important experimental findings.

PHYTOHORMONESBy F. W. Went, Calif. Inst. of Technology & K. V. Thimann, Harvard Univ.294 pages Illustrated $4.00

THE EGGS OF MAMMALSBy G. Pincus, Harvard University

160 pages Illustrated $3.75

VERTEBRATE PHOTORECEPTORSBy S. R. Detwiler, College of Physicians and Surgeons, Columbia Univ.


AUTONOMIC NEURO-EFFECTOR SYSTEMSBy W. B. Cannon and A. Rosenblueth, both of Harvard University


NEUROEMBRYOLOGY. AN EXPERIMENTAL STUDYBy S. R. Detwiler


PACEMAKERS IN RELATION TO ASPECTSOF BEHAVIOR

By H. Hoagland, Clark University138 pages Illustrated $3.00

DYNAMICS OF INFLAMMATIONAN INQUIRY INTO THE MECHANISM OF

INFECTIOUS PROCESSESBy Valy Menkin, Harvard University Medical School


s e94.W4acmd~ia ~.ea~aa*, 60 74f dea, ft e4

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14 SCIENCE-ADVERTISEMENTS VOL. 1017 No. 2621

SCIENCE-ADVERTISEMENTS

This new, improved Stokes Patented(McLeod type) Vacuum Gauge providesrapid (2 to 5 seconds) readings withinthe micron range with permanent ac-

curacy under all conditions. It does notrequire calibration against other gaugesand retains its accuracy in the presenceof all gases including hydrogen, andcondensable vapors including waterand oil.These gauges are compact, rugged, con-

venient to use as portable instrumentsor on fixed mountings. They are widelyused in physics, organic and physicalchemistry laboratories and by Industry. . . for applications such as dryingblood plasma, penicillin and biologicalsfrom the frozen state, organic distilla-tion under higher vacuum than here-tofore (in which ordinary closed-endmanometers are not adequate) and fortesting efficiencies of vacuum methods,apparatus and systems.

THOUSANDS IN USE

F. J. STOKES MACHINE COMPANY5958 Tabor Rd. Phila. 20, Pa.

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Principles of

Physical GeologyBy ARTHUR HOLMES, D.Sc., F.R.S.

Regius Professor of Geology and MineralogyUniversity of Edinburgh

A thoroughly up-to-date text book thatmeets the requirements of giving an

understanding of all the newer aspects ofthe subject without neglecting the solid pre-ceding achievements.HE method of treatment is one which twenty years'Texperience has shown to be successful in training

students and holding their interest even when some ofthem come to the subject with little preliminary ac-quaintance with scientific principles and methods. Thearrangement is planned to bring out the relationshipof each aspect of the subject to the whole, so that itssignificance can be properly grasped and appreciated.The book successfully incorporates the interesting re-

sults achieved through recent progress and the manyspectacular discoveries made possible by modern meth-ods of investigation. At the frontiers of establishedknowledge current interpretative views are introducedshowing the student the active growth of the subject, butalso indicating to him that a number of topics neces-sarily are controversial because the guiding facts arestill too few to provide a foundation for more than ten-tative hypotheses.

Illustrations

The illustrations aredistinctive and excel-lent. Over 200 of thefigures have been spe-cially drawn for thebook.

Photographs

The striking and in-structive photographshave been contributedby authorities inBritain, America andother countries.

640 pp.$4.00

The Ronald Press Company15 East 26th St. New York 10, N. Y.

Scope of ContentsA Preliminary Survey:Shape and Surface Reliefof the Earth; ChangingFace of the Earth; Mate-rials and ArchitecturalFeatures of the Earth'sCrust; Rocks as the Pagesof Earth History.External Processes andTheir Effects: Rock Weath-ering and Soils; Under-ground Waters; RiverAction and Valley Develop-ment; Development ofRiver Systems and Asso-ciated Landforms; Glaciersand Glaciation; Wind Ac-tion and Desert Land-scapes; Coastal Sceneryand the Work of the Sea;Life as a Rock Builder andFuel Maker.Internal Processes andTheir E1fects: Earth-quakes; Earth Movements;Volcanic Activity; Conti-nental Drift.

M.ARCH 23,2 1945

16 SCIENCE-ADVERTIS.MENTS VOL. 101, No. 2621

* Accuracy; rapidity; thepossibility of detecting andidentifying minute quantitiesand of making simultaneousdeterminations of severalcomponents; small samplerequirement; preservation ofsample and permanent pho-tographic recording of everyanalysis, are some of thereasons why the HeyrovskyPolarograph is so widelyused.The procedures established

thus far by go means definethe field of polarography-the perfected instrumentalsystem of the HeyrovskyPolarograph creates. unlim-.ited possibilities for analyt-icalandresearchapplications.A hibliQgitwhy of more than

_700 papers dealing with the po-larographic method of analysisand a booklet discussing thePolaroqrap# and lpolarographicanalysis arh ..vailble ' out-diarge ontes ;, r

The application of polarogktathii''-.,methods,of analyss etpands steadily..' Some of the,rapplications of the

Heyrovsk. Polarographs now in useare-Analysis of wiers for traceconstituents * 'Observation of dete-vrioration of transfornier oils * De-tection of incipient lead po

* Organi'c 'research. Analysis of:Brass. Ferrous alloys * Lead aloy ''- Ma'gnesium asoys * Nickelaloys -S29301 POLAROGRAPH-HyrO j.- AmericauIModel XH, Zinc alloys M

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ing solutions Ceramiics and glasses* materials for'productionrubber * -Vulcanized rubber for. E. H. SARGENT & COMPANYidentification of specific ingrdients 551i5 East Superior Steet, Chcag 11 Linois

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1.6 SCIENCE-AD RTISEMENTS VOL. 101. No. -2621

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I N T 1 E M- A RK ET P L A C ERates, 10¢ a word, minimum $2.00 cash in advance. Count 8 words if a box address is to be used. Display Inser-tions, $8.80 per inch. Copy should be sent to the Advertising Department, American Association for the Advance-ment of Science, Smithsonian Institution Building, Washington 25, D. C.

POSITIONS OPEN

Nutritionist. M.A., foods; M.S., physiology; workin nutrition and biochemistry towards Ph.D. Ex-cellent experience in nutrition and biochemical re-search, library methods. Writing ability. Location,New York City area. Box 119, " SCIENCE, " Smith-sonian Institution Building, Washington 25, D.C.Two permanent laboratory positions will be avail-able on June 1, 1945:

(1) Botany technician. Must be thoroughlytrained in fundamentals of botany and in botanicalmicrotechnique methods. Work consists entfely ofmaking and supervising the preparation of botanil-cal microscope slides. Good initial salary and ex-cellent opportunity for post-war advancement.Woman preferred.

(2) Zoologist well trained in comparative anat-omy. Must be familiar with or capable of learningmethods of injecting and enbalming animal speci-mens used for dissection. College degree desirablebut not essential. Initial salary dependent uponeducation and experience. Advancement should berapid after end of war. Young man preferred.Box 124, " SCIENCE,"1 Smithsonian InstitutionBuilding, Washington 25, D. C.Biologist with \ business and selling experience.Must be able to handle considerable volume ofsales and adjustment correspondence, and to act asassistant to manager in preparing catalogs andother direct-mail advertising matter dealing withbiological teaching supplies. This is an office posi-tion-no laboratory work and no travelling. It isan exceptionally worth while opening with an estab-lished company now operating at full capacity andwith excellent prospects for post-war expansion.Preference will be given to a man young enough togrow with the company and capable of assumingexecutive responsibilities. Initial salary, $5000.00per year for man with adequate background andexperience. Box 123, " ScIENCE, "X SmithsonianInstitution Building, Washington 25, D. C.Pharmacologist Wanted: Ph.D. for teaching pstin American institution abroad. Address inquiriesto NEAR EAST COLLEGE AssocIATIoN, Room 1707,50 West 50th Street, New York 20, New York.Meteorologist: Well-versed in the various recentsystems for long-range forecasting. Immediateavailability not essential. Midwest location. Box127, "SCIENCE," Smithsonian Institution Building,Washington 25, D. C.

INSTRUMENTS WANTEDWanted: Highest prices paid for Microscopes,any standard make. ERIC S0BoTxA, 15 East 40thStreet, New York City.Urgently Needed, Chambers Micromanipulators.Regardless of condition. Write to I. KRUGER,Room 1506, 95 Madison Avenue, New York 16, NewYork.

BOOKS AND PERIODICALSWanted to purchase Scientific Periodicals, For-eign-Domestic. WALTERl J. JOHNSON, 125East 23rd Street, New York 10, New York.For Sale: J. Am. Chem. Soc. 1919-30, bound, 1931-38, unbound, complete, new condition, at about halfprice, in Washington, D. C. Box 129, "SCIENCE,"Smithsonian Institution Building, Washington 25,D. C.

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POSITIONS WANTEDA Biologist with B.Sc. and Ph.D. degrees fromleading state universities is seeking a war job inan industrial or state laboratory. Box 122, "Sci-ENCE,"' Smithsonian Institution Building, Wash-ington 25, D. C.Bacteriologist- Immunologist- Allergist, M.D.many years of' teaching experience, formerly Ass.Prof. in leading Europe Universities, now Instructorin large Eastern medical school, American Citizen,desires permanent position (industry or univer-sity). Box 128, " SCIENCE, " Smithsonian Insti-tution Building, Washington 25, D. C.

INVENTIONS WANTEDInventors-The Lion Manufacturing Corporationof Chicago, a highly rated concern employing 1,400people, is interested in inventions for their plantand affiliated companies. Our interest is in pat-ented or patentable electrical or mechanical devicesfor post-war development in the following fields:Radio and Television, Sound and Recording, House-hold Appliances, Vending Machines, Coin OperatedAmusement Devices, in fact almost anything 'ofmetal or plastic. We invite inventors to send usdetails concerning their patented inventions. Ifyour invention is not patented, tell us in a generalway what you have to offer. If we are interested,we shall inform you how to communicate detailswithout endangering your rights. LION MANU-PACTURING CORP., 135 South La Salle Street, Dept.S, Chicago 3, Ill.

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The Catalog CornerPlease write directly to the company indicated for any publication you wish mentioning the bulletin number andSCIENCE. Publications are atis unless otherwise noted.

SCIENTIFIC BOOKS AND PERIODICALS are D.C. and A.C. voltmeters, ammeters, wattmeters,. .* . . .~~~~~~~~~~~~

Physics and Chemistry. Catalog from the book galvanometers, special types, such as a universal mul-shop of Walter J. Johnson. 337atlogf

nd pub- tiple-range D.C. and A.C. meter, current transformerslications of learned societies from periocls adto and resistance boxes. The "eCadet" line, for uselcationsofleawrneds.cietiesfromsingle copies to com- where accuracy does not justify more expensive instru-plete sets with prices. Listed separately are nearly ments is described. Electrical Measuring Instruments.1400 different titles (some in English and others in Catalog section SC-S. W. M. WELCH SCin TIrIC COM-the original foreign language). Recent volumes pub- PANY 1et5 SC-3.i W. MChica IENoIs.lished by the affiliated Academic Press are given short PANY, 1515 Sedgwick Street, Chicago, Illinois.descriptions. Catalog Twelve SC-3. WALTER J. Synthetic Chemicals. A comprehensive 135 pageJOHNSON, 125 East 23rd St., New York 10, N. Y. catalog filled with data about esters, synthetic waxes,Mc~raw-Hill Booksr The 1945 edition listing all emulsifying agents, synthetic resins, water soluble syn-

of this publisher's titles. 312 pages of texts and ref- thetic resins, water insoluble flameproofing and water-erence works in the fields of aeronautics, agriculture, proofing, wetting and foaming agents, deoderizingbiology, astronomy, chemistry and chemical engineer- agents, defoaming agents and plasticizers. Eaching, civil engineering, electrical engineering, geology, chemical is described accurately and its specific prop-mathematics and other scientific fields. Also included erties detailed. Known uses and suggested uses areare volumes by the company 's affiliated Whittlesey given. In addition, a wide range of formulae forHouse. McGraw-Hill Books 1945, Catalog uaturing staple articles is contained in a sepa-MCGRAW-HIILL Boon COMPANY, INC., 330 West 4~nd rate section. Chemicals by Glyco. 1944 CatalogStreet, New York 18, N. Y

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German Scientific Texts and References. A cumu-lated catalog lists 500 titles of which 35 have not been Buffer Tablets for pH Solutions. Buffer solutionsannounced previously and 141 published in Germany can be prepared freshly each time when needed forsince 1941. All reproduced under license of the Alien instrument standardization and stale solutions avoided,Property Custodian by Edwards Bros. Major fields according to the four page leaflet describing the newcovered are chemistry, engineering, mathematics, medi- Coleman buffer tablets. The tablets are dissolved ineine and surgery, physics and pharmacology. A mis- distilled water according to predetermined standardscellaneous section list minor fields such as patents, to get the desired pH. The tablets are available inphotography, ballistics, air navigation, etc. Author, hermetically sealed vials in either of two kinds: Bluetitle and series indexes cross reference each publica- (certified) for laboratory sale operations; and Rledtion. Prices are quoted by single volumes or advance (concentrated) for field or factoryseale work. Leafletsubscription by sets. Catalog Five SC-S. EDwARDS B-05 SC-S (including a sample in cellophane envel-BROTHERS, INC., Ann Arbor, Mich. ope). COLEMAN ELECTRIC COMPANY, 310 Madison

Chronica Botanica Books. An eight page leaflet Street, Maywood, Illinois.catalog of books published by this firm. Volumes Modern pH and Chlorine Control. An 83 pagelisted include forestry, marine microbiology, plant combination handbook and catalog. Fifty pages areviruses, paleobotany, inorganic nutrition of plants, ex- devoted to a simple as well as a technical explanationperimental cytology, and plants and vitamins. In- of pH control; precautions to be observed in makingeluded is detailed information about Chronica Bo- determinations; and discussion of the application oftantca, the international-bimonthly of plant science. pH, chlorine and phosphate control to 34 differentChronica Botanica 1945 Cataiog (2nd edition) SC-3. fields. The remaining 33 pages contain descriptionsTHE CRRONICA BOTANICA Co., Waltham 54, Mass. of Taylor Slide Comparators for pH, chlorine and

EQUIPMENT AND SUPPLIES

Flask Shaker. A leaflet describes a new piece oflaboratory apparatus that provides a modern and effi-cient method of performing what has been a time con-suming -and tiresome lab chore. A series of twinClamps (in 3' sizes for 8, 12, and 16 flasks) hold 300ml to 100 nml fasks-all mounted on acentral shaft.Simulated snap wrist action, from gentle swirling toviolent agitation; is controlledby a regulating knob.Operates on D.C. or 60 cycle A.C. 110 or 220' volt cir-cu-its. Leaflet SC-S. BURRELL TECHNICAL SUPPLYCoMPANY, 1936-42 Fifth Avenue, Pittsburgh 19,Pa.

Electrical Meamuring Equipment. Portable andswitchboard measuring instruments for collegelabora-tories and'suitable for industrial laboratory use areillustrated and specifications given in a catalog sectionissued by W. M. Welch Scientific Company. A com-plete line of such instruments with technical data(based. on A. I. E.-E. standards)' is shown and currentprices for each piece listed, Among the types shown

phosphate control and. -water analysis. HandbookSC-3. W. A. TAYLOR AND COMPANy, 7300 York Road,Baltimore 4, Md.Micro Manipulator for Experimental Operations.

A six page catalog section givesn details about, theChambers micro manipulator, that enables the operatorto conduct research in the; three dimensions of space.The instrument is. capable of impaling. on microneedles, drops having as small a diameter as 0.008. mm.for dissection. Cut-away diagrams and illustrationsshow the working of the mechanism and methods ofoperation. The section on uses is, enhanced by citingspecific references from the published literature di-rectly opposite each use. Among the operations theinstrument can be ue for are, isolating bacteria andyeast cells. in the production of.pure cultures; opera-tions upon ova in fertilization' problems; physical in-.vestigations on individual collodial particles; and in-vestigations-on carcinomatous tissues. B. ChambersMicro Manipulator. Catalog section SC-S. GAMMAINSTRUMENTCOMPANY INC. 95 Madison Avenue, NewYork 16, N.Y.

VOL. 10ly No. 2621.'18 SCIENCE-AD.VERTISEMENTS

SCIENCE-ADVERTISEMENTS 19

PHOTOGRAPHY OF

oscillograph Screen TracesTHE PHOTOGRAPHY OF OSCILLOGRAPH and cathode-ray tubetraces sometimes presents special problems. The technic andchoice of plate or film will depend on whether the trace is astationary pattern or a transient, on the time of persistence,and on the color of the light from the phosphorescent screen.The Kodak Research Laboratories have compiled a pamphlet

giving some practical data on the subject, and including par-ticulars of the plates and films most suited for its various as-pects. Copies of the pamphlet will be furnished free on request.

EASTMAN KODAK COMPANYResearch Laboratories Rochester, N. Y.

I. ~ ~ ~ ~ ~ ~ ~

* .*. Laboratory Reagents

GUARDTheir Well-Being

Hundreds of thousands of chemi-cal and biological analyses are con-ducted daily in the United States.This control work protects thequality of the water, food, clothing,drugs, fuel,. gasoline,. oil. and in-numerable other items essential tothe well-befing of our citizens.Thousands of laboratories utilizeC & B Laboratory Reagents.in control and researc'h work.

Catalog upon irepest.The COLEMAN & BELL Co., Inc.,

Manufacturing Chemists: NORWOODI, 0., U.S.A.

[(I) S.I4F.E~ .IA

1

MAIRCH 23, 1945


Anti-Aircraft Gun Crew- Official U. S. Navy Photograph

"Fire when ready!"Dramatic seconds pass while the

enemy plane approaches. It must bebrought down or a U. S. ship may sinkbelow the waves. Accurate marksman-ship literally becomes a life-or-deathmatter. And accuracy depends on manyfactors-chief among them being thegunsights such as supplied by Spencer.The Navy and Army have entrusted

the manufacture of some of the most in-tricate optical devices to Spencer becauseof a long record of success in producingscientific optical instruments of greatprecision.

In addition to thousands of standardmicroscopes and other instruments being

made for the armed services and war in-dustries, Spencer's production includesperiscopes, telescopes, aircraftgunsights,prism binoculars, azimuth instrumentsfor directing artillery fire, tank sights,and telescopic alidades for navigation.

Spencer LENS COMPANYBUFFALO, NEW YORK

SCIENTIFIC INSTRUMENT DIVISION OFAMERICAN OPTICAL COMPANY


physiological apparatus - science inductorium magnetic signals respiration pump parts andaccessories...

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