Kodak reports on:finding an organic compound when you aren't sure what you want .., a polyolefin you canmake springs out of ... film for photographing a tiny little speck in a great big sky

A devil of a job

See a typical page from the new "East-man Organic Chemicals Classified byFunctional Groups."

Putting this book together was onedevil of a job. It should have been done25 years ago, but we'd kept putting itoff and putting it off.The job was not done by a commit-

tee. One man decided how it ought tobe done and issued appropriate ordersto his helpers. We hope he has done agood job. Some other chemist wouldhave done it some other way. The otherway would have seemed far more sensi-ble to the other chemist. That's thetrouble with committees (althoughthey do have their uses). If a committeehad had to agree on the scheme, youwould not now be able to obtain acopy of Eastm;iami Organic ChemicalsClassified by Fictional Gr}ouips bymerely asking Distillation ProductsIndustries, Eastman Organic Chemi-cals Department, Rochester 3, N. Y.(Division of Eastman Kodak Com-pany).There are sonie 3700 Eastman Or-

ganic Chemicals for laboratory use. Tolook one up in our regular alphabeti-cal "Eastman Organic Chemicals ListNo. 41" for availability, package size,price, structural formula, and MP orBP, you must know what specific com-pound you want and how we interpret

Chemiiical Abstr-acts nomenclatura 1 rulesin naming it. This isnl't always easy.Now, if you first consult " . . . by

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109

PHOTOPERIODISMAND RELATED PHENOMENAIN PLANTS AND ANIMALS

AAAS Symposium Volume No. 55

Editor: Robert B. WlAhrow >

Proceedings of the Gatlinburg Conference-on Photoperiodism, 29October-2 November 1957, sponsored by the CQmmittee on Photo-biology of the National Academy of Sciences-National ResearchCouncil and supported by the National Science Fcundation. Prefaceby Alice P. Withrow.

57 papers by 75 authors. 6 x 9 inches, 921 pages, 256 illus., genera and species index,subject index, cloth, 1959. Price $14.75. AAAS members' cash orders $12.50.

The volume surveys the plant and animal facets Xo photoperiodismand portrays a diversity of approaches in the study of photoperiodicphenomena in a wide range of organisms. The various papers arepresented from the perspectives of the photochemist, biochemist,plant physiologist, and zoologist and are by well-recognized membersof the various disciplines. This is a unique and stimulating contribu-tion toward the understanding of photoperiodic function in thebiological kingdom, and it provides a fundamental basis for theanalysis of various parameters of the phenomenon.

CONTENTSPhotochemical PrincipalsPhotocontrol of Seed Germination and Vegetative Growth by Red LightRole of Chemical Agents in Photocontrol of Vegetative GrowthPhotoperiodic Control of Reproduction in PlantsGrowth Factors and FloweringAnalysis of Plant PhotoperiodismThe Relation of Light to Rhythmic Phenomena in Plants and AnimalsPhotoperiodism in the InvertebratesPhotoperiodism in the VertebratesPhotoperiodic Control of Reproduction and Migration in BirdsControl of Periodic Functions in Mammals by Light

British Agents: Bailey Bros. & Swinfen, Ltd.Hyde House, West Central Street

London W.C.1, England

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1515 Massachusetts Ave. NW,Washington 5, D.C. spread occurrence of gibberellin-like

substances in plants was presented byC. A. West.New concepts on the relation be-

110

MeetingsPlant Growth RegulationThe fourth International Conference

on Plant Growth Regulation was heldat the Boyce Thompson Institute forPlant Research, Yonkers, N.Y., 10-14August. The conference was sponsoredjointly by the Institute, the New YorkBotanical Garden, and the BrooklynBotanic Garden. Previous internationalconferences on growth regulators havebeen held at Wye College in 1955, atthe University of Wisconsin in 1949,and in Paris in 1937 under the auspicesof the League of Nations. The con-ference was attended by 126 invitedparticipants from 17 countries. The pro-gram was coordinated with the ninthInternational Botanical Congress, heldat Montreal, Canada, 19-29 August.Financial assistance was obtained fromthe Rockefeller Foundation, the Nation-al Science Foundation, and 15 indus-trial concerns interested in agriculturalchemicals.The first day was devoted to natural-

ly-occurring plant growth substances;the second, to the gibberellins; andthe third and fourth to the syntheticauxins and other plant growth sub-stances. In addition to the scheduledpapers, there was ample time for dis-cussion at each session. The papers pre-sented and the remarks made duringthe discussion periods will be publishedin book form by the Iowa State CollegePress. Copies will be sent to each par-ticipant and will be available to othersat a nominal cost.Among the outstanding new dis-

coveries revealed at the conference wasthe isolation of a new class of auxinsfrom Maryland Mammoth tobacco byD. G. Crosby and A. J. Vlitos. A tonof tobacco leaves and growing tipsyielded about 10 mg of active chemi-cals. One was identified as 1-docosan-ol, the other is a long-chain fatty acidnot fully characterized as yet. BruceStowe also presented data showing thegrowth-promoting action of long-chainaliphatic compounds.

This was the first international growthconference at which the gibberellinswere discussed. The Japanese scientistswho did much of the early work on thegibberellins, T. Hayashi, J. Kato, andY. Sumiki, took part in the conference.P. W. Brian, of the Akers ResearchLaboratories in England, who was in-strumental in drawing the attention ofthe Western world to the Japanesework on gibberellins, reported on newdevelopments from his laboratory. Evi-dence indicating the probable wide-

SCIENCE, VOL. 131

tween structure aind auxin activity, withspecial reference to requirements forreaction with the necessary bindingsites, were discussed in separate papersby K. V. Thiniann and J. van Over-beek.A feature of the conference was a

memorial dinner in honor of the lateP. W. Zimmllernman. It was in his labor-.atory at the Boyce Thompson Institute,in cooperation with his associate, A. E.Hitchcock, that 2,4-D was first foundto have marked effects on plant growthand development. Indolebutyric acidand 1-naphthaleneacetic acid were alsofirst investigated as growth regulantsby Zimmllermiian and Hitchcock. Exten-sive investigations by these authors werealso carried out with derivatives ofbenzoic acid and a variety of substi-tLuted aryloxyacetic acids, in additionto 2,4-D.

Major addresses at the conferencewere given by William J. Robbins, di-rector emeritus of the New York Bo-tanical Garden, who spoke at the me-morial dinner for P. W. Zimmermiianon expanding concepts of plant growthregulation, and by James Bonner ofCalifornia Institute of Technology, whodelivered an address on the probablefuture of auxinology.The day after the scientific sessions

of the conference ended, the partici-pants were taken on a chartered boataround Manhattan Island, where theyhad an opportunity to meet membersof the botany departments of Columbiaand Rutgers universities and staff memii-bers of the three sponsoring institutionswho were not directly interested inplant growth substances and, therefore.were not participants in the scientificsessions.

George L. McNew, managing di-rector of the Boyce Thompson Insti-tute, was chairmlan of the organizingcomm ittee for the conference, andA. J. Vlitos, who originally suggestedthat such a conference be held, servedas secretary. Vlitos, formerly at the In-stitute, is now with Caroni Ltd., inTrinidad.

LAWRENCE P. MI I ERBoyce Thomzp.,von In.stitlite for PlantResearclh, Itnc., Yonkers, Newv Yo-rk

Forthcoming Events

February

1-4. American Soc. of Heating. Refrig-erating and Air Conditioning Engineers,semi-annuLal, Dallas, Tex. (Miss J. 1.Szabo, ASHRACE, 234 Fifth Ave., NewYork 1.)

1-4. Instrument-AuLtomation Conf.,Houston, Tex. (Director, Technical andEducational Services, Instrument Soc. ofAmerica, 313 Sixth Ave., Pittsburgh 22,Pa.)

1-5. American Inst. of Electrical Engi-8 JANUARY 1960

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neers, winter general, New York, N.Y.(N. S. Hibshman, AIEE, 33 W. 39 St.,New York 18.)

1-5. Clinical Cong. of Abdominal Sur-geons, Miami Beach, Fla. (CCAS, 633Main St., Melrose 76, Mass.)

2-4. Haemopoiesis-Cell ProduLctionand Its Regulation, Ciba Foundationsymp. (by invitation only), London, Eng-land. (G. E. W. Wolstenholme, CibaFoundation, 41 Portland P1., London,W. 1, England.)

2-4. Society of the Plastics Industry(Reinforced Plastics Div.), Chicago, Ill.(W. C. Bird, SPI, 250 Park Ave., NewYork 17.)

3-5. Military Electronics, IRE winter

conv., Los Angeles, Calif. (G. B. Knoob,Motorola, Inc., Military Electronics Div.,1741 Ivar Ave., Hollywood 28, Calif.)3-6. American College of Radiology,

New Orleans, La. (W. C. Stronach, 20N. Wacker Dr., Chicago 6.)

3-6. Parathyroid Research, symp.,Houston, Tex. (R. V. Talmage, Dept. ofBiology, Rice Inst., Houston.)

4-6. American Soc. for Metals, SanFrancisco, Calif. (R. Huggins, ASM, Stan-ford Univ., Stanford, Calif.)

4-6. Congress on Administration, 3rdannual, Chicago, Ill. (R. E. Brown, Amer-ican College of Hospital Administrators,840 N. Lake Shore Drive, Chicago 11.)

5. Parenteral Drug Assoc., New York,

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112

N.Y. (H. E. Boyden, PDA, 4865 StentonAve., Philadelphia 44, Pa.)

7-9. Congress on Medical Educationand Licensure, Chicago, Ill. (CMEH,AMA, 535 N. Dearborn St., Chicago 10.)

7-10. Radioactive Isotopes in ClinicalMedicine and Research, 4th intern. symp.Bad Gastein, Austria. (R. Hofer, 2ndMedical Univ. Clinic, 13 Garnisongasse,Vienna IX, Austria.)

10-il. Gas Cooled Reactor, symp.,Philadelphia, Pa. (F. L. Jackson, FranklinInst., Philadelphia, Pa.)

10-12. American Acad. of OccupationalMedicine, Williamsburg, Va. (L. B. Shone,Bureau of Medicine and Surgery, NavyDept., Washington 25.)

10-12. Solid States Circuit Conf., Phil-adelphia, Pa. (T. R. Finch, Bell TelephoneLaboratories, Murray Hill, N.J.)

10-13. National Assoc. for Research inScience Teaching, 33rd annual, Chicago,Ill. (C. M. Pruitt, Univ. of Tampa, Tam-pa, Fla.)

10-13. National Soc. of College Teach-ers of Education, Chicago, Ill. (E. J.Clark, Indiana State Teachers College.Terre Haute.)

11. Protein and Amino Acid Require-ments of Swine, Chicago, Ill. (J. T. Sime.Assoc. of Vitamin Chemists, EvaporatedMilk Assoc., 228 N. La Salle St., Chicago1.)

11-13. Society of Univ. Surgeons, Min-neapolis, Minn. (B. Eiseman, 4200 E.Ninth Ave., Denver 20, Colo.)

14-18. American Inst. of Mining, Met-allurgical and Petroleum Engineers, an-nual, New York, N.Y. (E. 0. Kirkendall,AIME, 29 W. 39th St., New York 18.)

16. Astronomical Soc. of the Pacific an-nual, San Francisco, Calif. (S. Einarsson.Leuschner Observatory, Univ. of Califor-nia, Berkeley 4.)

18-19. Chemical Inst. of Canada (Pro-tective Coatings Div.), Toronto, Ont., andMontreal, Que., Canada. (Scientific Liai-son Office, National Research Council,Sussex Drive, Ottawa, Canada.)

18-20. National Soc. of ProfessionalEngineers, winter, Wichita, Kan. (P. H.Robbins, NSPE. 309 Bancroft Bldg.,Univ. of Nebraska, Lincoln.)

21-24. American Inst. of Chemical En-gineers, Atlanta, Ga. (F. J. Van Antwerp-en, AICE, 25 W. 45 St., New York 36.)

22-25. Technical Assoc. of the Pulpand Paper Industry, annual, New York.N.Y. (J. Winchester, TAPPI, 155 E. 44St., New York 17.)

22-4. Scientific Management, 12th in-tern. cong., Sydney and Melbourne, Aus-tralia. (C. M. Gray, Federal Council ofthe Australian Inst. of Management.Western House, 83 William St., Mel-bourne, C.1, Victoria, Australia.)

24-26. Biophysical Soc., 4th annual.Philadelphia, Pa. (O. H. Schmitt, Bio-physical Soc., Chairman, Program Com-mittee, Univ. of Minnesota, Minneapolis.)

25-27. American OrthopsychiatricAssoc., Chicago, Ill. (Miss M. F. Langer,1790 Broadway, New York 19.)25-27. Cell Physiology of Neoplasia

(14th annual symp. on fundamental can-cer research), Houston, Tex. (Editorial Of-fice, Univ. of Texas M. D. Anderson Hos-pital, Texas Medical Center, Houston 25.)

26. Highway Geology, 11th annual

SCIENCE, VOL. 131

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GRASSLANDSEditor: Howard B. Sprague 1959

6" x 9", 424 pp., 37 illus., index, clotht.Price $9.00, AAAS nieaiibers' cash or-ders $8.00. AAAS Symiposiunii VolumeNo. 53.

This voluLme is intended as a review ofknowledge on many aspects of grass-lands resoulrces. The 44 authors wereselectcd by their ok n profcssionail col-leagLIes as being pai ticlaIrly compctentto present the respective subjects.Thirty-seven papers are arranged tindcerthese chapter headings:1. Sciences in SuLpport of Grassland

Research2. Forage ProduLIction in Temperate

Hulmiid Recions3. Engineering Aspects of Grassland

AgricultUrC4. Forage Utilization and Rclated Ani-

mal NuLtrition Problems5. Evaluation of the Nutritive Signifi-

cance of Fora-es6. Gr.assland Climatology7. Ecology of Grasslands8. Range Management

British Agents: Bailey Bros. & Swinfen, Ltd.,Hyde House, W. Central Street,

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AAAS, 1515 Mass. Ave., NW,Washington 5, D.C.

20-23. American Assoc. of DentalSchools, Chicago, Ill. (R. Sulllen, 840 N.Lake Shore Drive, Chicago I1.)(See issue of 18 Deceo,lber for com,iprehen.iv e list)

symp., Tallahassee, Fla. (W. F. Tanner,Geology Dept., Florida State Univ., Tal-lahassee.)

28-5. American College of Allergists,Miami Beach, Fla. (E. Bauers. 2160 RandTower, Minneapolis 2. Miin.)

29-3. American College of Surgeons,Boston, Mass. (H. P. Saluinders, 40 E. ErieSt., Chicago. 111.)

29-4. PittsbUrgh Conf. on AnalyticalChemistry and Applied Spectroscopy,Pittsburgh, Pa. (L. P. Mlelniich, U.S. SteelCorp., Mlonroeville, Pa.)

Mlarch

3-5. American Acad. of Forensic Sci-ences, Chicago, Ill. (W. J. R. Camp,AAFS, 1853 W. Polk St., Chicago 12.)

4-6. Nationall Wildlife Federation. Dal-las, Tex. (C. H. Callison, 232 Cairroll St.,NW, Washington 12.)

6-13. American Otorhinologic Soc. forPlastic Surgery, Miami Beach, Fla. (J. G.Gilbert, 75 Barberry Lane, Roslyn Heights,N.Y.)

7-9. Wildlife Mlanagement Inst., Dallas,Tex. (C. R. GuLtermruth, 709 Wire Bldg.,Washington 5.)

7-11. American Soc. of Civil Engineers,New Orleans, La. (E. S. Kirkpatrick,ASCE, 33 W. 39 St., New York 18.)

10. Recent Developments in PoultryNutrition (Assoc. of Vitamin Chemists),Chicago, 111. (J. T. Sime, Director of Re-search, Evaporated Mlilk Assoc., 228 N.La Salle St., Chicago 1.)

13-14. Americain Otological Soc.,Miami Beach, Fla. (L. R. Boies, UniversityHospital, Minneapolis 14.)

14-16. American Railway EngineeringAssoc., annLual conv., Chicago, 111. (N. D.Howard, AREA, 59 E. Van Buren St.,Chicago 5.)

14-17. Positive Health of Older People,forum, Miami Beach, Fla. (A. Mallach,National Health Council, 1790 Broadway,New York 19.)

15-16. American Broncho-Esophango-logical Assoc., Mliami Beach, Fla. (F. J.Putney, 1712 LocuLst St., Philadelphia 3.)

15-21. Nondestructive Testing, 3rd in-tern. conf., Tokyo and Osaka, Japan. (S.Ishizaka, Scientific Attache, Embassy ofJapan, 2514 Mlassachusetts Ave., NW,Washington 8.)

17. Congress for Pharmacists, 2nd an-nual, Jamaica, N.Y. (Congress for Phar-macists, PuLblic Relations Oflice, St. John'sUniv., Janmaica 32.)

17-19. American RadiLum Soc., conf.,San JuLan, Puerto Rico. (ARS, 635 EastUnion, Pasadena, Calif.)

17-19. Blood Platelets, intern. symp.(by invitation only), Detroit, Mich. (NIissS. A. Johnson, Henry Ford Hospital, De-troit 2.)

17-20. International Assoc. for DentalResearch, Chicago, 111. (D. Y. Burrill,Northwestern Univ. Dental School, 3 11E. Chicago Ave., Chicago I1.)

18-19. American Laryngological Assoc.,Miami Beach, Fla. (L. Richards, Massa-chusetts Inst. of Technology, Canmbridge39.)

nace consists of a tantalum heating ele-ment surrounded by tantalum andmolybdenum radiation shields, water-cooled tank and bellows assemblies.

SCIENCE, VOL. 131

New Pro uctsThle iniformtiationt re-ported hler-e is obtainied fromn

manu facturers a01(1 f,-o001 othler sources coi ideredto hes s-liaible. Neither Sciclnce nior the writer as-sumes-z respon sibiliti for t/se succuiracY of tfse ii-formation. All iiiqiiiriies co50ce1i-101i itemtls listedslioizlld be addirsiidsi to tl/eic lazfacturer. Inclutcle thle depsartmloislt iliii)ber ill i our i.nciiry'.

* PULSE GENERATOR, comiipletely transis-torized, supplies 15-volt positive andnegativ e pulSes with separately con-

trolled amplitudes. Pulse wxidth is varila-ble from 0.5 to 1 00 sec with rise timleless than 0.1 -,sec. Repetition rate is con-tinLoously variable between 20 and 500)pulses/ sec. Output pulse delays up to100 ,1sec and anticipation up to 1t)busec relative to sync output are in-cluded. (Solidyne, Dept. Sci272, 7460Girard Ave., La Jolla, Calif.)

* CURRENT-REGUI ATED POWER SUP PI Y

fLurnishes 0 to 2.5 amp in four over-lapping ranges. Voltage range is 0 to300 volts. Regulaltion for 10 percentchange in load inmpedance or line volt-age is 0.2 percent in the current range0.2 and 2.5 amp. Ripple is 0.2 percent(mniax.) peak to peak. Input power re-quiremiient is 208 volts, three phase,60 cy,/sec, and 1.5 kva, with additional0.5 kva in one phase. (Applied Radi-ation Corp., Dept. Sci273, 2404 N.Main St., Walnut Creek, Calif.)

* CHROMATOGRAM SCANNER draws a

curve of color density as a function ofdistance scanned along a paper strip.SimLiltaneously, the curve is integratedand a second pen draws saw-toothmarks whose number is proportional tothe concentration of each componentseparated on the strip. A balancing camis used to make results linear wvith con-centration. Other cams are availableto present output linear in percent trans-mission or in optical density. (BeckmanInstruments Co., Spinco Div., Dept.Sci282. Stanford lndustrial Park, PaloAlto, Calif.)

* A-C VOLTMETER, model 403A, is a

transistorized, battery-operated instru-ment with a frequency range I cy toI lcv/ sec. Voltage is measured in 1 2ranges from 1 mv full scale to 300 voltsfull scale. Accuracy is --3 percent from5 cy to 500 kcy/ sec, and + 5 percentover the remainder of the range. Noiseis less than 50suv. Battery life is 400hr. (Hewlett Packlard Co.. Dept. Sci283.275 Page Mill Rd., Palo Alto, Calif.)

* VACUUM FURNACE, model 59-TA, fortensile and creep testing, provides tem-peratures to 4000 F. The tubular fur-

IMMEDIATELY VISIBLE TRACES WITHOUT PROCESSINGAvailable with 6 or 1 2 galvanometers and a variety ofpaper speeds. Trace velocities to 10,000 in./sec., fre-quency ranges to 3,000 c.p.s. Indispensable for staticand dynamic analysis of strains, vibrations, pressures,etc. Daylight loading, records can be stored permanently.Superb quality, unmatched performance, moderate cost.

WRITE FOR FREE INFORMATION IEIOU U. gtmj IeU...21

MULTI-CHANNEL OSCILLOGRAPHS 0 POLYGRAPHS, ALL KINDSKYMOGRAPHS AND ACCESSORIES * DC SERVO-GRAPHIC-RECORDERCHOPPER AMPLIFIERS * STIMULATORS * STEREOTAXIC UNITS

MICRO-MANIPULATORS

-

8 JANUARY 1960

I

Two NewCatalogues

RADIOACTIVE CHEMICALS

RADIOACTIVE SOURCES

RADIOACTIVECHEMICALS

., ,..... ,""f.,.

RADIOACTIVESOURCES

Information on thecomprehensive range ofradioactive materialsoffered by the Radio-chemical Centre is nowconveniently divided intotwo catalogues. Thecatalogue of Radio-chemicals incluLdesinformation on1 primaryisotopes and labelledcompounds of interest toall who use radioactivetracer methods and alsoradioactive pharma-ceuticals. The catalogue ofRadioactive Sourcescontains information onsealed radioactive sourcesand appliances of interestto research workers,radiotherapists andindustrial users of ionisingradiation. Both cataloguesalso include informationon radioactive referencesources for calibratinginstrumlents and onirradiatioiis in the researchreactors at Harwell.

REQUESTS FOR THESECATALOGUES ARE INVITED

THE RADIOCHEMICAL CENTRE

AMERSHAM - BUCKINGHAMSHIRE * ENGLAND

TAS/RC.47

115

GLASS ABSORPTIONCELLS made KLETT

SCIENTIFIC APPARATUSKlett-Summerson Photoelectric Colorimeters-Colorimeters -Nephelometers- Fluorimeters-Bio-Colorimeters -Comparators -Glass Stand-ards-Klett Reagents.

Klett Manufacturing Co.179 East 87 Street, New York, New York

I

tantalum plate and rod electrode assem-bly, vaLcuum puLmping and gaging ports,and auxiliar) components. Operatingpower is 14 volts, 1600 amp. Over-alldiimensions are 44 in. high by I in.in diameter. ( Marshall Products Co.,Dept. Sci287, 270 \V. Lane Ave.. Co-lumbLus 2, Ohio.)

* NOISI GENLRAxIroi., nmodel NG 1000A,provides ranbdond noise with G,auLssiianarmplitude distrihbLtion xxithin + 2 per-cent probabilitx from 2 to 98 percentprobability and with frequency spec-trimn varialble ovcr a wide rang e. Anelectronic metering cir-cuit reads direct-ly r.nm.s. and miealil vaIlue of either gen-erated noise or noise on any vxariablein analog computer- sinIlILaItion. Outputvoltasze is vxariable from 0 to 6 voltsfor the xvidest blaind width shapino filteirand 0 to 1 volt for the narroxx est filter.(GI'S Insti-ument Co., Dept. Sci29 .

1 80 Needharn St.. Newton. NMass.)

* SIGNALi ANALY./1'R permits mea.suLre-ment of amplituIdes from 300 cy to400 kcvxsec. The instrLument uises theheterodyne principle atndc highly selec-tive crystal filters. Nletering circLits in-dicate levels fronm -80 to +32 dbmwith accUracx said to be -(0. 5 dh. ( Rail-\xvax Communlnicaltions Inc., Dept. Sci-308, 9351 E. 59 St., Raytown 33, NMo.)

* LOW-FREQUENCY OSCIL I ArOR, type

1305A, covers frequencies between 0.0(1and 1000 cy/sec. The output is continu-ously variable in phCase and is calibratedfrom 0 to 360 deg. TIhree- and four-phase outputs are also atvailable. Ac-curacy of output phase is --0.5 deg forangles less thatn 10 deg. MaximnUm erroris +3 deg at higher rh..se anngles. Smallphase differeinces cLan be mealsured aitany point with aIcuracy -0.25 deg.OLutpLit voltage is indicated. (GenerallRaldio Co.. Dept. Sci286, WA'est Con-cord. Mlass.)

* LEAK DETi c roR of mass spectrometertype is a hcliuI-senlsitive inlStlrUment ca-p,able of detecting a leak rate of 10-standard cm:'sec wx ith 10-percent de-flection of an OLutput meter and a signil-to-noise ratio of I or better. Respoinsetime is less thaln ' sec for 31 of finalresponse. Seven raLnges provide full-sc.lde raLtes from 10 - to 10" cm ' sec.An auLIxilialrx vaLcuum system is providledfor evacuaLtion of the svstem undler-test. (Crosbv-Teletronics Corp.. Dept.Sci293. 299 Robbins ILane, Svosset.L.I., N.Y.)

* SIGNAlI SAMIPL ING UNIT, for use xxvithconventional oscilloscopes, makes pos-sible viexx ing of repetitive pullses xxithrise tinies less than 0.5 mysec on oscil-

loscopes wxith 500 kcy/ sec band pass.NMaximum repetition rate is 50 kcy/sec.A companion unit permits triggeringfrom pulses aInd sine xx ves xxith repeti-tion rates exceedint, 300 MIcy/sec. Timestability is said to be better thaLn 0.2mnusec. Sensitivity is 30 mv/cm with3-to- I signal-to-noise ratio. The sanm-pling techniqLue is the same as that usedCin the manufactUrer's model 2 sam-pling oscilloscope. (1I umLatron Electron-ics. Inc.. Dept. Sci294. 68 Urban Ave..Westhurv, L.l. N.Y.)

* SCINT[ILLt XTION 1)1FTECTOR is provideidwith ani integral transistorized preampli-fier capable of driving 500 ft of calIe.The preanmplifier operaitecs oIn a smallportion of the voltage sIpplieed to thenIultiplier phOtOtUbc. Rise time is 0.1 5tisec; an internal clipping circLit setsOuItpuIt pul]se duiraltion alt I /Asec. Op)eal-t-ing requirements iicluide 0.5 > mna al100)0 volts. positix c high-voltage inpuIt.and cable mnatching inipeclrince of 1)0ohnm at the armplifier ciend. Outp)Llt SigaIlpolarity is ngcoativc. Intcrchangyeablealpha. beta. and ganmma detector- crystalscan be furnished. (Technical NJeCasurc-ments Corp.. Dept. Sci303, 441 W ash-ingyton Ave., Noi-thl Haoven. Conn.)

JosNiio x SI(i orN/Vuiosuial BlIJC(,i, Of .SIo(ll(I(' dx.[Vaxhlinr.you I).c

LUMETRON Model 402-EP

I -

I Speed, versatility, and convenience in measuringI optical rotation, eliminating strenuous peering

through an eyepiece with dark-adapted eyes.I

U **S;.;^0F-, '*T-L.,L ALSO: pH Meters, Colorimeters, Fluorescence Meters, Densitometers.

116

ELECTRONIC

ICOLONY COUNTERA brilliantly illuminatedcolony counter that marksas it counts automatically.

Th is>11si,111l tI'll'lt1)1'()-= i(lts toi' I F(1- - rI -f sio1 ll tl (SI'oI-ct I +)ds I'( I-

-COunItill, ' ''IOl(.in

-V\11'1011.s C'Olt.l 1('l'S.

i - l.I itss r( I ()()ie (l

I I.s i c l )I I Ixith( ii.FsCof11p)1t.l IsF tl'('lui l, tc(l.-

A- iiraFIv IccoFd'F(01(1Is I)ii IIi t F(OlI) IIF(.- -\11115 lIsofh()I (ILcIs FolIII\N 'iihastlI l FtL i( --

-1)ro tFtclilt.iIFs ;11 l(t I'0l . lI ItIioioatiFit(OLiit'Ls ;111(1

- 1 F'5 is iFFll tit 'illu- l)uCtillrci iIItdll' ii l-- )uil(sI il'ig i-S liOt mFlllFr. l i kill"n 1)(I 111,1v bc

- piticxx lhiF Is mis ks d glis 1). iF s it C()Llllt0s. (O:)II -

- )L 't() xit i uxli blh sill on1 ul Itci" iut((ill Itic ICSFit to

UNCONDITIONAL ONE YEAR GUARANTYWrite for Catalog C700-J8S

NEW BR~.I~~IUNSWICK SCIENTIFIC CO., INC.

P.O. BOX 606, NEW BRUNSWICK, NEW JERSEY

SCIENCE. VOL. 131

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