FEBRUARY 2, 1945 SCIENCE-ADVERTISEMENTS

%,Soraa REINHOLD g'o4IVOOD CHEMISTRY

Edited by LOUIS E. WISEInstitute of Paper Chemistry, Appleton, Wisconsin

An entirely new treatise in which all the vast complexity of wood and cellulose chemistry is discussed andto a great extent resolved by an outstanding authority in each field. Comprising an invaluable compendiumof up-to-date information in both theoretical and practical aspects of this vital subject, this volume is ofgreat importance to organic chemists, and to research workers in the pulp and paper, rayon, cotton andwood products industries.900 Pages A.C.S. Monograph No. 97 Illustrated $11.50

CHEMICAL MACHINERYAn Elementary Treatise on Equipment for Process Industries

By EMIL RAYMOND RIEGELProfessor of Industrial Chemistry, University of Buffalo

Author of "Industrial Chemistry"PRACTICAL-COMPREHENSIVE-AUTHENTIC-this book is the result of hundreds of inquiries fromeducational institutions and from all branches of industry. From screens to heat exchangers, from bucketelevators to potentiometers, each of the major types of equipment used in the chemical and process industriesis described in detail. Specifications and latest available prices are included wherever possible. Classifica-tion of equipment by function gives the discussion a natural and logical organization which will appeal bothto students and to those who are interested primarily in obtaining the machine best suited for their particularrequirements..579 Pages 438 Illustrations $5.00

THE TECHNIQUE OF THE TERRAINMaps and Their Use in the Field in Peace and War

By H. A. MUSHAMMajor, U. S. Army, Retired-Lecturer in Engineering Science,

The Technological Institute, Northwestern UniversityHere's a book that helps you understand military strategy and tactics by stressing the importance of ac-

curately knowing the "lay of the land." It clearly and simply explains how to record terrain correctly;the use of relief, contours, indications of distance and directions, and aerial photography. Ideal for Armyand Navy officers, surveyors, petroleum geologists, and students of military geography.228 Pages Illustrated $3.85

INFRARED SPECTROSCOPYIndustrial Applications

By R. BOWLING BARNES, ROBERT C. GORE,URNER LIDDEL, V. Z. WILLIAMS

Stamford Research Laboratories, American Cyanamid Co., Stamford, Conn.An informative, authoritative work in a field of increasing interest, presenting exhaustive data on the de-termination of physical properties from fundamental spectroscopic measurements, with extensive bibliog-raphy. Exceedingly valuable for physicists, chemists, and particularly for those engaged in experimentalwork in synthetic rubber and petroleum derivatives.236 Pages Illustrated $2.25

Send Today for 19 5 Free Catalog, "Let's Look It Up" (200 Titles)

REINHOLD PUBLISHING CORP.330 West 42nd Street New York 18, N. Y.

Also publishers of Chemical Engineering Catalog, Metal Industries Catalog, Metals and Alloys, and Pencil Points

9

b

SCIENCE-SUPPLEMENT

SCIENCE NEWSScience Service, Washington, D. C.

THE PRODUCTION OF TUNGSTENTUNGSTEN and molybdenum, rivals for favor in the

war-essential rare-metals family, are now available insufficient quantities to meet the most important needs,among which are the 15,000 types of items used mostlyin electric lamps and electronic tubes, according to thelamp division at Bloomfield, N. J., of the WestinghouseElectric and Manufacturing Company, one of the largestAmerican producers of pure tungsten for electrical usesfrom imported wolframite ore. Its production of tung-sten from the imported ore is now sixteen times as greatas in pre-war years, and the production of molybdenum,from an American ore, has increased to about the sameextent.In pre-war years tungsten ore came principally from

countries now wholly or partly under Japanese control.Chinese ore is reaching the United States, but it has tobe brought by aircraft transport into India and shippedfrom there by boat. The United States is one of theprincipal molybdenum mining and smelting countries.

For use in electronic tubes and lamps, both tungstenand molybdenum must be in a high state of purity. Theprocessing of both requires intricate and precise hand-ling. The metals are reduced to powder form and laterpressed into ingots strong enough to be drawn into veryfine wire or to be formed into rods and sheets. Boththese metals have high melting points, both have electri-cal conductivity about one third that of copper, and bothcompare favorably with the more expensive metals, plati-num and tantalum, in their ability to resist corrosion.

Tungsten is slightly superior to molybdenum in somerespects, but it is limited as to size and form, and weighstwice as much. It is one of the heaviest of all metals.It has the highest melting point of all. High-speed cut-ting tools are approximately 20 per cent. tungsten, andcan be used on a lathe until red hot without losing hard-ness. Tungsten alloys, particularly steel alloys, are usedextensively in many types of machines and especially inwar munitions.Molybdenum is a silvery white metal with a high melt-

ing point, and is used extensively in steel alloys to in-crease tensile strength, as well as in electric lamps andelectronic tubes. It is also used in high-speed cuttingtools as a substitute for tungsten. In steel alloys it isparticularly valuable in protecting against corrosion, andespecially against sulfur corrosion. It is called indis-pensable in vacuum tubes and all other electric equip-ment where high conductivity, great strength and rigidityat high temperatures are required.

ITEMSOvER 400,000 words a day are sent out by the Army's

super radio station in France, that has direct hookupswith London, Washington and the Army 's worldwideradio communication system. The multiple-channel 40-kilowatt station, costing an estimated $2,000,000, was

sending and receiving trans-Atlantic messages 25 daysafter it arrived in France in 1,000 shipping boxes. Thepower of this station may be compared to some of the

major standard broadcasting stations in the UnitedStates. Station KNX in Los Angeles, WBBM in Chi-cago, WLW in Cincinnati and WABC in New York areall rated 50 kilowatts, and these are among the mostpowerful broadcasting stations in the country.

A NEW and important library collection on militaryaeronautics has just been started by the Air TechnicalService Command of the Army Air Forces at WrightField, Ohio. The collection already numbers more than3,000 volumes and is used daily by research engineers.assigned to development and experimental projects.Many early books on aviation subjects, some dated as.early as 1784, provide valuable historical background,while more recent technical data, American and foreign,are essential to the ATSC 's responsibility for develop-ment and experimentation on new aviation equipment.Miscellaneous material, including air combat intelligencereports from World War I and back issues of aviationmagazines and newspaper clippings on aviation subjects,have also proved valuable. The ATSC invites the publicto contribute pertinent material to the Wright Field:Library. Persons interested in making such contribu-tions are invited to write a letter describing the docu-ments they have. Correspondence should be addressedto: Chief, Technical Data Laboratory, ATSC, WrightField, Dayton, Ohio.

EPIDEMICS of streptococcus sore throats and scarletfever that threatened the technical schools of an Army AirForce were prevented and cases of these ailments re-duced almost to zero by sulfadiazine prophylaxis, accord-ing to a report made by Capt. Richard G. Hodges of theArmy Medical Corps in the New England Journal ofMedwine. Cases of pneumococcal pneumonia were alsosignificantly reduced, as were attacks of ordinary respi-ratory disease which the layman would call a cold. Rhin-itis, pharyngitis, laryngitis and acute bronchitis wereincluded in this group. Captain Hodges suggests that theeffect of sulfadiazine prophylaxis in reducing these ail-ments is probably because a fair proportion of them werecaused by bacteria and not by the virus of the commoncold.

QUICK, easy, inexpensive and accurate is a new method,using an indicator solution recently developed, to distin-guish between manganese bronze and aluminum bronze inscrap and other metal. In the past this has been largely-guesswork, because of the similarity in appearance of thetwo alloys. The discovery was made by the U. S. Bureauof Mines at its experiment station at Pittsburgh. To.make the test, a small area of the metal is cleaned thor-oughly of all dirt, scale and grease by grinding. This spotis then sprayed with a sulfuric acid solution. After theacid has had several seconds to react, a drop of the indi-cator solution is added. If the metal is manganese bronzea grayish-purple spot appears; but if it is aluminum bronzethe spot is greenish-yellow. The indicator solution con-sists of varied weights of ammonium-mercury thiocyanate,silver nitrate and ammonium persulphate.

10 VOL. 101, No. 2614

FEBRUARY 2, 1945 SCIENCE-ADVERTISEMENTS 11

-__ LAKISTON BOOKS__MORRIS'-Textbook oF Human Anatomy Edottion

"We are using Morris because the students react very favorably to the book'-says a teacher. The large number of well drawn illustrations, clearly labelled-

55~X'3t$- the clear, bold type which helps locate any particular structure-the clinicalVt ^ CoOx°t aspects mentioned with the study of each structure-the embryological references

(IO¶ 4tpa1es in each section-these are all good reasons why the text is so popular in the class-room.

By Collaboration of eminent anatomists, edited by J. PARSONS SCHAEFFER, M.D.,Jefferson Medical College.

KRIEG-Functional Neuroanatomy"I am using it and find it excellent in setting the anatomy in the student's mindby giving enough function to make the subject understood"-says a teacher. The

24 t illustrations are superb and the method of presentation is very stimulating-it is'1S an entirely new approach to the study-all the questions an interested student canAtlas. ask are answered one by one-it is new and readable. Many impressive comments

5S3 p50tage's from teachers using the book are coming in.$f. BY W. J: S. KRIEG, PH.D., Institute of Neurology, Northwestern University School

of Medicine.

BREMER-WSEATHERFORD-Textbook oF Histology Edition

l,9SVal"A great quality of the book is its clarity and simplicity of style which bothBremer and Weatherford have achieved to an outstanding degree "'-says ateacher. The unusual illustrations have great teaching value-the sections onthe shapes of cells by Dr. Lewis and on the placenta by Dr. Wisloki add much tothe value of the text-the treatment of histology from the developmental pointof view is very logical.By HAROLD L. WEATHERFORD, PH.D., Harvard University

STILES-Handbook of MicroscopicCharacteristics of Tissuesand Organs Edifnln

"It will help any student in the laboratoryand will save much of the instructor's timeas well "-says a teacher. The general planimpresses me as an ideal study guide-thestudents are doing better work with thisbook at hand.

By K. A. STILES, PH.D., Coe College.Illustrated, 204 Pages, $1.50

____TH

DAVISON - STROMSTEN Mam-6thmalian Anatomy Edition

"Dr. Stromsten's drawings of the cat'smuscles are the best I have ever comeacross "-says a teacher. It is very wellplanned and suits our purpose admirably-the emphasis on comparative studies andthe section on the preparation of materialare good -nearly every structure men-tioned in the text is shown in some figure.By F. A. STROMsTEN, State University ofIowa.

174 Illus., 328 Pages, $3.00

BLAKISTON COMPANY_PHILADELPHIA S. PA.

FEBwARY 2, 1945 SCIENCE-ADVERTISEMENTS 11

12SINEAVRIEET O.11 o21

E~xW 9A,,

INDEX FOSSILS OF NORTH AMERICABy HERVEY W. SHIMER and ROBERT R. SHROCK

Since its publication in May 1944, Shimer and Shrock has been acclaimed as a worthysuccessor to the renowned Grabau and Shimer's NORTH AMERICAN INDEX FOS-SILS, which appeared in 1915. Completely up-to-date, prepared with the assistance ofthe leading authorities in their respective fields, the book has already taken its place asthe greatest contribution to that branch of science in recent years.

Here are two of the many laudatory published comments on this book:This justifiably expensive volume isanswer to many a geologist's plea. Ithe stratigrapher and paleontologistfind assembled the essential informationwhich they have previously been force(search through countless dusty tomeswidely scattered journals. . . . It bring:to date the technique of Grabau and Shiiand is both more inclusive and much beillustrated than that time-worn predeces

-American ScieiMay 1944 * 837 pages @

It is a library in itself. . . . Never beforehave we had such short, concise, yet ampletaxonomic descriptions. . . . Shimer andShrock have managed to combine thestrictly scientific with the fully utilitarian.. . .It is the greatest contribution to ad-vancement in our branch of science sincethe first edition of the Eastman-Zittel Text-book of Paleontology.

-PERCY E. RAYMOND in Science

Illustrated * 7%1 by 103/4 * $20.00

Oe4. 4eade c 7e ?dOPTICAL CRYSTALLOGRAPHY

By ERNEST E. WAHLSTROM, Asso-ciate Professor of Mineralogy and Petrog-raphy, University of Colorado

It is safe to say that this book stands alonein its field.... It is the most readable andmost useful book on the subject that has yetbeen produced.

-JEWELL J. GrAss in Science

August 1943 $3.00

ERUPTIVE ROCKSBy JAMES SHAND, Professor of Geol-ogy, Columbia UniversityAs the volume now stands it has the meritof a truly international perspective....Students who use this book will be gratefulfor the clear, straight-forward presentationof facts and theories.

Second EditionSeptember 1943

-American AcMent7st

$5.00

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

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12 SCIENCE-ADVERTISEMENTS VOL. 101 No. 2614

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FEBRUARY 2) 1945 SCIENCE-ADVERTISEMENTS 13

1SIE E-ADETSMNSVL 0,N.21

Your laboratory and production-control people canquickly learn to use this super magnifier

Factory-production specialists, as well as research workers and dis-ease fighters, now have available a compact, easily-operated super-magnifier in this new console-model equipment. Permits directobservation at five thousand diameters. Built-in camera makes it asimple matter for practically anyone to make good micrographsquickly. Instrument operates from any ordinary 110-volt A. C. lightsocket.The instrument shown in the small picture at the left is the RCA

"Universal" model, which permits direct magnifications ranging from100 to 20,000 diameters, in 40 steps. This is the last word in modernmicroscopy.A special RCA booklet, amply illustrated, gives complete descrip-

tions of and specifications for both of these instruments. A copy of thisbooklet will be sent to you promptly, on request.

RADIO CORPORATION OF AMERICARCA VICTOR DIVISION . CAMDEN, N. J.

In Canada, RCA VICTOR COMPANY LIMITED, Montreal

14 SCIENCE-ADVERTISEMENTS VOL. 101, No. 2614

SCIENCE-ADVERTISEMENTS

IN 1690, under the sign of "The Archimedesand Two Pairs of Golden Spectacles" on

London's Ludgate Street, John Marshall in-vented the modern method of simultaneouslygrinding a number of lenses by cementingpieces of glass to a convex sphere and grind-ing them with a concave spherical tool.

One of the great opticians of the late 17thcentury, he stated, with more truth thanmodesty, in an advertisement published in1693: "He hath also invented a doublemicroscope, a pocket microscope, and a wheelperspective glass with a concave eye-lens fitfor all weathers; these are more useful thanany yet have been."

Today, modern methods of mass produc-tion of accurate optical instruments andparts are supplying scientists in Industry,Education, and the Armed Forces with thesolution to important war-time problems.Some of these methods, such as the mass

production of roof prisms, are the products of

Perkin-Elmer research.Soon, Perkin-Elmer, combining all its pre-

war knowledge, experience and skill with theideas and techniques of its war-time produc-tion methods, will bring welcome refine-ments to scientific optical instruments forpost-war analysis, control, inspection, andobservation.

WHAT PERKIN-ELMER MAKES

Perkin-Elmer serves the optical sciences thatbroaden man's horizons by supplying themwith:

Custom-built optical instruments for in-dustrial analysis, control, and inspection.New optical devices to solve specific prob-

lems, such as the all-purpose infraredspectrometer.

Special elements such as fine lenses, prisms,flats, photographic objectives, interferom-eter plates, retardation plates, Cornu prisms,Rochon prisms, Nicol prisms.

* S111~~~~~

PzBp.uAny 2, 1945 15

War shortages crop up in strangematerials. Mica, for instance.Once seen principally in the win-dows of stoves, and in smallboys' pockets, it is now used ex-tensively as electrical insula-tion. In some war products, itis virtually indispensable: capac-itors for radio, spark-plugs forairplane engines, insulators inelectronic tubes.With demand mounting,

manufacturers were desperate.

A four-man technical missionflew to London to help rationthe world's supply between theUnited States and Great Brit-ain. The shortage was serious.The War Production Board,

convinced that much mica wasclassified too low when judgedby appearance alone, asked BellTelephone Laboratories to de-velop a new method of electricaltests. The Laboratories wereable to do this quickly because

of their basic knowledge andexperience in this field.The new tests were made

available to manufacturers inthis country and abroad-thesupply of usable mica was in-creased 6o%-and a difficultsituation relieved.

Skill to do this and other warjobs is at hand in Bell Labora-tories because, year after year,the Laboratories have been atwork for the Bell System.

4t BELL TELEPHONE LABORATORIES Exploring and inventing, devising and perfectingfor our Armed Forces at war and for continued improvements and economies in telephone service.

FEBRUARY 2, 1945 SCIENCE-ADVERTISEMENTS 17

FOR LATEST AUTHORITATIVEREVIEWS ON LABORATORY

PROCEDURES

A monthly publication cornpiled for laboratory direc etors, technicians and physi-cians. Full of essential factsand reviews of current literature on labora-tory procedure, professionally edited by R.B. H. Gradwohl, M. D., -c. D. A neces-sity in, the modern laboratory. Published by

GRADWOHI3514 Luas. AV.

SCHOOL OFLABORATORYTECHNIQUESt. Louis, Mo.

Microscopis!Shillaber's Examination Liquids, refractive in-

dices (D line, 250 C), from 1.40 to 1.80; for tem-porary mounts. By choosing examination liquids

according to index, you can render portions of a

specimen transparent or can develop maximum con-

trast as needed for purpose of critical study. Theseliquids are entirely stable and non-volatile up to1.70 index. 1.75 and 1.80 liquids are slightly vola-tile, less stable, chemically inert to nearl all ma-terials. Liquids will not harden on standing.

Packed in 14 oz. square, screw capped bottles. In-dices 1.40,1.4, 1.50, 1J55, 160, 1.65, each 40¢, or the setof six $2.00; index 1.70 75; 1.75 per 10 g. (3 ml), 75#;index L1, per 10 g. (3 ml), $2.00. All nine items, asdescribed, $5.00. Larger quantities of the 1.75 and1.80 liquids at the same rate. Minimum order (withremittance) $1.00. Minimum charge order $2.00.

These liquids will facilitate microscopical ex-amination of unknowns, bring out details otherwiseinvisible or indistinct, and they will make possiblethe maximum resolution afforded by the best apo-chromatic lenses.

Have you seen the new Shillaber's Photomicrog-raphy? Recommended for all workers in advancedmicroscopy. Leaflet on request.

R. P. Cargille118 Liberty Street New York 6, N. Y.

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Bacto-Agar

Bacto-Agar is a purified Agar prepared fromdomestic material. In the manufacture ofBacto-Agar extraneous matter, pigmented portions,and salts are reduced to a minimum, so that theflinshed product in the form of fine granules willdissolve rapidly, giving clear solutions.

Bacto-Agar is distributed only for use inbacteriological culture media upon propercertification by the purchaser.

Bacto-AsparagineBacto-Asparagine is a purified ano acid

widely used in synthetic culture media and in thepreparation of tuberculin.

Specify "DIFCO"THE TRADE NAME OF THE PIONEERS

In the Research and Development Qf Bacto-Peptone andDehydrated Culture Media

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Model AAA Tni-Purpose Projector

Also Available to Schools,, Laboratories, tet.Spencer Projectors for 2 z 2", 31 x 4"1. and opaquematerialBausch & Lomb Projectors for 31 x 4'1 and opaquematerialS.V.E. Projectors for single & double frame 2 x 2"1.-slides and filmstripsAmpro Sound Projectors-l6 mm.

JARRELL-ASH COMPANY165 Newbury Street' Boston 18,Mas

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FEBRUARY 2P 1945 SCIENCE-ADVERTISEMENTS 17

SCIENCE-ADVERTISEMENTS VOL. 101, No. 261418

PHOTOVOLTOptical

Fluorescence Comparator

For 4uantitative analysis of fluorescent solutionsby means of' fluorescent standards; for vitaminsquinine, atabrine, drugs oils, organic and inor-granic~compounds.Highsenstivity Smple In oPeration

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Write for literaturePHOTOVOLT CORP.

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NEW LaMOTTE "ABCOF pH CONTROL" HANDBOOK

(12th edition)

If you do not have a copy,write at once for your

\\.,cp,*c \ FREE copy of this helpfuland informative handbook.It contains up-to-the-min-ute information for thoseinterested In proes con-trol, boiler feed water con-trol and of water, sewageand industrial wastes. Alsoinformation on LaMottesimplified methods andequipment for making vari-ous tests in these fields.

LaMOTTE ROULETTE COMPARATORThis model was espe-cially designed for ac-curacy in making pHdeterminations. TheLaMotte PermanentColor Standards are-contained in a-,revolv-ing drum- always inplae-.permitting im- _mediate lH determi-nations dfaY or night, with simplicity, and conven-ience. Highly rommended for research and centrallaboratory, control work. Range, any three sets ofstandards in intervals of 0.2 pH. Accuracy 0.1 pH.Complete, f.o.b., Towson 4, Baltimore, Md., $75.00.

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automatic tissue processingby any histologic techniqueeffecting routine twenty-fourhour reports on all sections

automatic fixation .. .formalin, Bovin, Zenker, or any other elective, method

wutomatic washing... thorough cleansing by flush-action, constant change

system automtic dehydration... alcohols, dioxane, acetone or any other

preferred technique, and in any sequence tic clearing...chloroform,benzine, xylol, cedarwood oil1 aniline oil, or alternates tomaic nfiltIon

paraffin, celloidin, etc. automatic decalcificatlon ... nitric, formic, pkcricacids, or other fluids automatic staining of slides with any staining agents.

Descriptive literaturc, avilable

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FEB~uARY 2, 1945 SCIENCE-ADVERTISEMENTS 19

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