New ProdutictsThe ijlifOtimtion7t0)tetlhepor ther is obtaited fromI

mlalnlfacturers and(i ftorin other sourcels 1onistolereilit) Ibe reliable. NeitheI- Science ttor thle writer as-k1f,1MIN 1CSp(.-owllsi/biliti, fol- tl1(* a1c'curac1(,' o) thet ill-to- intitiolt. A cotpont fo)' u1e ill matihittti qirelt.slt'tc 1tcerntilittg te1(titetlis li,sted it inc(llolel ill trie ptostc(rdS insetrt. Cit Cle trhC d('it11itllt itt i1t1titt et' Of thle

it(olsi 1s li/1 c)r lv) ere'-(stedol*It/li.s coupevll.

* INTEGRATING ANMPI IFIFR for use withchromi.atogralphs accepts the output ofthe chromatograph amplifier and pro-Luces an outpult to the recorder that isdisplayed as deflection from a base line.When the coniponent has been com11-pletely eluLted, the recorder trace againruLns parallel to the base line. Height ofthe step mleasures area uLnder the con-ventional chromatogram peaL-k. Alter-native Oltput systellms sUch as indicatingmzeters or digitizers can also be uised.(Jarrell-Ash Co., Dept. Sci711, 26Farwell Street, Newtonville 60.MI ass.)

* 256 CH\NNEL ANALYZER feaLtures pre-selected automllatic progra,ming: mag-iletic tape autxiliary memory 600 to2500 volts high-voltage power supply:single-plslIh-button malantlal operationand six mlodes of readouLt. Desiredanalyzer cycle of I12 operations. includ-ing accunUllate. display, comlplemiient,print, and selective storage, can be pre-programed by patchboard. The analyzerauL1tomatically perforniis the specifiedoperations at the touch of a single buLt-ton. ( R.adliiation CouLnter Laboratories,Dept. Sci713, 5121 WV. Grove. Skokie.111. )

* P'OTLENTIOMETRIC Rt CORDER has beenr-edesigned to increase flexibility andconvenience. Among the changes areai constant voltage reterence using aZener diode and eliminating batteries,standard1 cell and standardizing mecha-nisIm: coIm1partm1;ented meaSUring cirCilitthat interchanges as a uLnit for rangechanging; plug-in unit for multipointrecorders that interchanges to changenUlmber of points recorded froml 2 to24 points: plug-in aminplifier unit.(MN/tinneaipolis-Honeywell, Dept. Sci7 14,\Vayne and Windriml Aves., Philadel-phia 44, Pa.)

* SY NC HRONOUS MOTOR for slow speedsconliprises t\A o identical counter-rotatinam11otors in a hOUSing. On1e m11otor is con-niected to the 60 cv/sec line: the other.to a varilble-frequency powxer supply.If the variable frequency is 60 cv sec,the output shaft is stationaLrv anti op-poses rotation w ith fLull motor torque.An increase or decrease of the variabletrequency causes rotation forward orreverse. Motors can be supplied fronm

50 to I hp. (Genisco Inc.. Dept.Sci725, 2233 Federal Ave., Los Angeles64, Calif.)26 AUGUST 1960

* MAGNETIC TAPE PLOTTING SYSTEMpermits plotting of digital computer re-sults in continuous curve fornm on anX-Y recorder. The svstem includes atape transport. a digital nmagnetic tapetranslator, a tape-control uinit, amipili-fiers, and an X-Y recorder. The trans-lator permits continuous plotting up to4 in./sec of curve generatcd by a coIll-puter interpolating roiltine at informila-tion change rate of 100/sec. Point plot-ting at 00 pointsinin speed at 2-in.spacing is also provided. Accuracy issaid to be better than t 0. 1 percent offull scale. (F. L. Moseley Co., Dept.Sci7 15. 409 N. Fair Oaks Ave., Pasa-dena, Calif.)

* FREEZF-DRYING SYS-TEM feaftures con-densing coils built into the VaICUIlu dry-ing chabber. Sanmples are trozen anddried in the samiie vacuunm chamber.Forty pouLnds of prodLuct load or up to1300 10-nil vials can be processedsimultaneoUsly. Cabinet is on casters foreasy moving. (RePP IndLustries, Inc.,Dept. Sci716. Gardiner. N.Y.)

* INTERCHANG,EABLE OPTICAI. SYSTEM

for the manufacturer's I R-7 prism-grating infrared spectrophotomleter ex-tends the range of the instruLm1ent to the200 to 700 wavemembers region. Thisextension of range is accomiplished byequipping the interchange with acesium-iodicle prism and a 30-,u blaze,30-line/nmn, long-wTavelength grating.The prisnm, grating, associated drivemlechanismiis, slit-programi potentioml-eter, and frequency readout 1are mount-ed together on a casting that dluplicatesmlechanically the original equipimient.Replacemiient requires 2 or 3 minutes.(Beckmian Instrumnents, Inc., Dept.Sci7 17, 2500 Fullerton Rd., Fullerton,Calif.)

* SIGNAL GENERATOR generates waveshapes necessary for frequency andtransient response tests of servo com-ponents and systems. These includeforcing voltages for the servo and ac-cessorv wave shapes for cathode-rayoscilloscope display. Data frequency iscovered in the ranges 0.01 to I and 0.5to 30 cy/ sec. Carrier frequencies from60 to 2500 cy sec are accommnltodated.(Industrial Control Co.. Dept. Sci7 1 8.Central Ave. at Pinela\xn, FaLrm ingdale,N.Y.)

* MONOCHROMATOR of large aperture,manufactured by Hilger & Watts, Inc.,has available a range of interchangeableprism systemis that cover the ultraviolet,visible. and infrared regions of the spec-

GRAPHIC RECORDER-offers exceptionalsensitivity, speed,and accuracy...

as low as $300

(Model JY-100)

Here is a superior quality recordingpotentiometer, engineered for modernlaboratories, and offering these advan-tages-all standard:

Fast balance time-only 1/2 second.High accuracy-1/2% of span.Span: 10 mv (Model JY-100); 10 mv to100 V, with 10-step attenuator (ModelJY- 110)5" chart widthHum suppressor minimizes stray 60-cycle pickup.Chopper stabilized-no zero-drift prob-lems.Floating high-impedance input -withseparate chassis ground.Many other quality features. Write forcomplete data.

trum. The base is designed for ulse as atable model or tor fitting to an acces-sory bar. Twxo instrunments can bemounted together to flunction as adouble nionochromator. (Engis Equip-

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ment Co.. Dept. Sci724, 431 S. Dear-born St., Chicago 5, 111.)

* DIGFFAL VOLTMETER converts an un-known input Voltage into decimal nunm-her indication with accuLracy said to ben0.5 percent of full scale and full-scaleresponse time 24 second. Both digitallaind quasi-ligital indications Ire obtain-aLble; in the litter the numbers moxve bvthe indlicator windoNx wxithout fralming.Inptit impedaicc is one nmegohmii on allof threc available rangcs: () to 2.5.() to 25. and () to 250) volts. Ranges otft) to 0.25 and 0 to 25)00 x olts are alsoaxailable. SSize is 0 hx .4 bx 9 inI.(Llectro-l oic Corp.. Dept. Sci7 26.5 I 5 Boccaiccio AXC.. Venice.Cal.it.)

* PHOTOGRAPHIC RECORDER uses 16-nimiifilmnl to record up to 1 6 channels ofinformnation. Fronm 4 to 32 hours ofdata can be recorded on 200-ft reelsat speeds of 3 to 21) cml 'min. The filmliS autOmlatic.allx developed xithin therecordler and c;n bc xviex ed magnifiedten timies on the instrumrent's screenwithin It) ninutesC. Date. timle. andfilml nulmlber ,are printed on the film]duLrin} recordine. Trace xx idth is ().05mm. \With gail anomii etcrs. tIreqLuen1cVresponIse is d-c to 2(0 cy sec or uLp toI 50 cx sec on special order. \W ith acaithode-rax ti.hbe. d-c to 1.5 kcx seccan lie recordeid. (The GcotechnicialCorplationl. Dept. Sc678. '4(11 ShilohRdl.. CGarl-nd. Te\.

Neatest little test tube rackyou've ever seen!

Nalgene" laboratory plastic -unbreakable, acid-proof,

outlasts metal or wood!Here is the unique new test tube rack, New lightweight Nalgene plasticof Italian design, that outlasts them test tube rack stands free, or in

2-unit or 4-unit plastic base.all. It's the only holder that lets you seethe contents of each tube from top to bottom. Plastic fingershold tubes securely; unit fits shaking machines. Nalgeneplastic throughout-chemically inert, easy to clean,immersible in water baths, withstands 120° C. Try a few inyour lab. You'll like them.

WRITE for Catalog Sheet N-11, Dept.158.

TIHE NALGE CO. INC. ROCHESTER 2, NEW YORKToday's Most Complete Line of Plastic Laboratory WVare

57()

* SURGICAI SCIN riLLATION DETECTORconsists of a basic detector, a selectiolnof probes with crystals, and a tungsten-alloy colliniator shield. The detectorhouLsing is I in. in dlianmeter by 91i4 in.long. It contains a mlultiplier phototuLecand a transistorized preamplifier. Threeheta-gamnia sensitive needle probes andla manuilK1 scalnning probe aire tfLrnished.The needlle probes are: 2 mm in dial-mleter bx It cni long. 3 mm bv It) cnm.and 6 mi bx 5 ciii. Each consists ol'a thalliumn1 actixVated cesiuml iotIdidecrxstal and a licht pipe. The probes"ire sensitixe onlx at the cndls. An auLralIratemeter indicatinir bv change of pitchis ix ailable lor LIsxS ith the detector.NulCleair Chicago CorO .. Dept. S6ci731).

. q Fa;st Ho\ a-1i Axec.. DCes Pla;inles.111. )

s \1 iI Ri 5 ii x S I i \1 is capableot simlitanCoriC)Isl program iriTg aiilrppvlx ing rapid vaariltions ot teiipera-

toLre. loadl. and strain \5while ecordineeachxc itbh respect to tillme aIs xvll asloadVC -SLs stYaiai. Applied torce isCountinIioiisl\ x ariabmle lrom -1I(l.t)0)0 to

(().11(1(1 lb it rates tip) to 000() lb'see.RKtm \x elocitx is controllkalc tI niii 0) to

in. sec thil11OLIt aIn Sin. strokc.-1 xso toLlnction enerailrtois are piroxidleil(or ti-.aislatlrin pellcil l-d rass np ro,raichlVrts into opera-tinel control signals.I)rogram diiiaILtiO1i is atdjuLstaLble bCtx\ cCil1( and 30( secoCndcs. ( Research Inc..Dcpt. Sci7 31. P.O. Box 6164. EdlinesStationl. Miineapolis 24. \linn. )

* R( -Ri SISrTN(c 1otvr ides I5kx at 60) ma a-c tor testinc the abilitxof solid insul.atingy materials to resistthe action ot an arc according toAS IMNI specification D-4935. Voltage iscont0inuooslx xvariablc Irom] zero. Anelecti-ode assembly. slpecimiieni holder.and a jic for sharpening clectrodes areieloiLled. An interxVal tiiiier xith man-Li'l reset meaSuI-CS ai-C application timliCto the nearest O. secoiid. ( AssociatedResearch Inc.. Dept. Sci733. 3727 \V.Bclmiiont Ax e.. Chic.-ao 1 8. Ill.)

* \i xGNtETIC-TPIxI RtFCORDINi( SYSTi 'Iis capable of recoriling txx o channelso(f xv id-ebanil inormation owver the fre-quiencxC spiectruL] tlroiii It0 cv to 4\Icx'' sec x ith aIniplittUde response flatto 3 dlb. anid tVo aiLiXil i'arv chalnnelsx\ith frequency response 200 cv to 1kcx sec. Tape used is 2-in. uvide, I .0mil. Mvlar. A rotaltine Ma"netic healdthat records in a transverse tlashion pro-xviles a hecad-to-tape speecil ot 1,30))in./ sec with tape speel of 12.5 to 25in. sec. TrIacks are ().0(10 in. xvide andl(.0(1 5 in. on centers. The recordingalssembly is mainitainedi at ain operatingteniperaltUre ot 60 C to ensuLre stabilitxot tape dimiiensions. ( Am pex DataProduLcts Co., Dept. Sci736, Box 50t)0.Redxxood City, Calif. )

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* SYNCHRO TEST FIXTURES accommo-date size-5 to size-19 synchros for test-ing transformation ratio, phase shift, im-pedance, input current, and input power.Included are holding clamps, mountinghardware, and clanmp wrench. (AnglerIndustries, Dept. Sci7 19, 3 LexingtonDrive. Metuchen, N.J.)

* EXPANDABLE WORK BASE for tensile-testing machine increases by a factor ofapproximately three the work area,available for setting up tests that requirebulky gripping devices and instrunientccessories. The work base is portableand is said to be easy to install. (W. C.Dillon & Co., Dept. Sci721, 14620 Kes-wick St., Van Nuys, Calif.)

* PLATINUM RESISTANCE THERMOME-TER is designed for measurements at li-quid-hydrogen temperature. Operatingrange is -435 to -400°F. Accuracyis said to be --+0. 1°F. Resistance at-435°F is 19.8 ohms; resistance changeover the operating range is 27.6 ohnis.Thermal time constant for measure-ments of liquid hydrogen is said to beless than 200 1,Lsec. (Transonics, Inc.,Dept. Sci723, Burlington, Mass.)

* DECIMAI-BINARY SWITCHES that con-vert decinial constants to a positionalnunmber code are available keyed tovtlrious binary code combinations, forexaniple, strCaight binary, excess 3, 2-4-2 1, or gray. Selectors are avalilable witheight or ten detented positions. Mount-ing area is 1.3 in.' Rating is 0.5 anipinclusive, 1 anmp resistive at 30 voltsdI-c. (Minneapolis-Honeywell RegulatorCo., Dept. Sci727, Freeport, lll.)

* MICROTOME KN1FE SHARPENER willaccomtmnodate any microtonme knife upto and including 185 nim. The sh(arpen-ing process is autom1atic, the operatorbeing required to insert the knife intoa holder and to apply honing conipoundto a vibrating glass hone plate. An elec-tric tinier is set to stop the operation.Subsequent hand stropping is said tobe unnecessary. (Anierican OpticalCo., Dept. Sci729, Buffalo 15, N.Y.)

* MINIATURE P'RINTER operates atspeeds of niore than 30 characters persecond. The device is 91,4 in. Iong andfits into a standard 3-in. instrunmentcase with self-contained paper supply.Output is a 5/16-in. talpe. (Potter In-strunment Co., Dept. Sci732, SunnysideBlvd., Plainview, N.Y.)

* TEFLON BOTTLES availlable in 1-, 2-,and 6-liter sizes are of one-piece, iiiold-ed construction. Stoppers and pouringspouts are also of Teflon and are fas-tened by a stainless-steel screw-lock ar-r'angement. (Cheniplast Inc., Dept.Sci742, 3 Central Ave., East Newark,N.J.)26 AUGUST 1960

* HANDLING DEVICE for very small ob-jects operates on compressed gas atpressures of 1 to 2 lb/in.2 Flow of thegas in the pencil-shaped device producesa reduced pressure at the unsharpenedend of a standard hypodermnic needleof diameter appropriate to the size ofparticle to be held. To release the heldparticle, the operator stops an orificewith his finger, thereby creating a high-er pressure that repels the particle.(Penfield Manufacturing Co., Dept.Sci734, 19 High School Ave., Meriden,Conn.)

° LABORATORY HOMOGENIZER is saidto be capable of processing saniples assnall as 1 oz with results equal to thequality obtainable with production ho-mogenizers. Up to 8 gal/hr may beprocessed. All contact parts are 18-8stainless steel. Thermostiatically con-trolled heater is an optional accessory.(C. W. Logeman Co., Dept Sci740,633 Bergen St., Brooklyn, N.Y.)

* EVAPORATOR UNIT for concentrationof radioactive samples is said to in-corporate a technique that inhibits dep-osition of niaterial otn any but the col-lector surface. Liquid capacity is 1000nil. Two to three hours are requiredto concentrate 90 percent of all radioac-tive niaterials on a 2-in. planchet. witharea of deposition variable between]12 and 2 in. Heating unit is self-con-tained. (Nuclear Corporation of Amer-ica, Dept. Sci743, Denville, N.J.)

* HIGH-VACUUM STOPCOCK with Teflonplug uses 0-rings to provide vacuumseals. The seals are designed to preventleaks from one side arm to the otheras wxell as at each end of the borosili-cate glass barrel. Single or doubleoblique bores are available. (ScientificGlass Apparatus Co., Dept. Sci744,Bloomfield, N.J.)

* BAt ANCE available in capacities of1000, 2000, and 4000 gin, is said toindicate correctly in spite of off-levelconditions. No addition of weights isrequired within the range of indica-tion. Removal of a substitution weightextends the range. The balance is mag-netically danmped. (August Sauter ofNew York, Inc., Dept. Sci746, 866Willis Ave., Albertson, N.Y.)

* DEAD-WEIGHT GAGE is operated wxithwsater. Weights are supported on a tube,the upper end of which is supported bya platform opercated by the piston. Anmechanical stop prevents disengage-ment. Accuracy of 1 /20 percent issaid to be standard and -I /30 to beobtainable by selection. Constructionmaterial is 416 stainless steel.(Mans-field and Green, Inc., Dept. Sci763,1051 Power Avenue, Cleveland 14,Ohio)

ELECTROLYTIC

CONDUCTIVITY...DIP TYPE ?

CELLS

Every Laboratory ConductivityCell now a certified cell at noextra cost!

You can now obtain fromIndustrial Instruments a dip typeglass and platinum electrolyticconductivity cell in any cell con-stant from 1/100 to 100 withcertified accuracy within +±°1%of nominal value.

Write for a complete catalog ofconductivity cells and measuringinstruments and equipment.

II.'-#

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* VAPOR DETECTOR for acetone, alcohol,and hydrocarbons is said to detect con-centrations in the parts-per-billionrange. The detector utilizes the flameionization principle, measuring electronconcentrations resulting from the in-troduction of the vapor into a purehydrogen flame. Response is said tobe linear up to concentrations of 2 per-cent. The instrument is portable, operat-ing from self-contained batteries.(Carad Corp., Dept. Sci735, RedwoodCity, Calif.)

* PNEUMATIC SIGNAL CONVERTER re-

ceiv,es any standard square-root orother pneumatic signal in the range 3to 15 lb/in. gage, and uses this signalto position a canm. A pneumatic tracing

Write today for morecomplete information.

device senses the profile of the cam and,through a relay, transmits a convertedpneumatic signal corresponding to thecam. Sensitivity is said to be better than0.2 percent, accuracy ± 1 percent offull scale or better, and speed of re-sponse less than 0.5 second for fullscale. (Brooks Rotanmeter Co., Dept.Sci739, P.O. Box 432, Lansdale, Pa.)

* LOADING REACTOR is designed to pro-vide a convenient inductive load thatcan be made adjustable by using it witha variable transformer. It consists ofa gapped, strip-wound, toroid-corewire wound and embedded in epoxycompound. Ratings are: 1220 volts, 60cy/sec, 2 anmp continuous, 3 anmp inter-mittent, inductive reactance 60 ohms.

B/A Flame Photometer Condensed Specifications. Metals An-alyzed and Guaranteed Sensitivity (1% of full scale):Metal meq/l mg% ppmNa 0.001 0.002 0.02K 0.0025 0.001 0.01Li 0.028 0.02 0.02

Reproducibility: +0.5% av. Size: 15" x 17" x 16" Wgt.: 35 lbs.

|2 .A1/ADZ:-X1 RO/LAofC,1/1VC. s

574

resistance 4 ohms, inductance, 0. 1 6 hy.(Superior Electric Co., Dept. Sci737,83 Laurel St., Bristol, Conn.)

* TEMPERATURE CONTROLLER uses a

servo null-balance system to indicatecontrolled temperature on a 10-in. scale.Time-proportioning or on-off control,with or without anticipation, is avail-able. Control stability of the propor-tioning model with anticipation is saidto be ±0.1 °F and indication accuracy-+-0.5 percent of full scale. Alarm con-tacts can be included. (Electronic Proc-esses Corp. of California, Dept. Sci748.436 Bryant St., San Francisco, Calif.)

* SWITCHI CIRCUIT ASSEMBLY for ap-plication to digital systems produces asingle square-wave output pulse, syn-chronize(d with an external clock pulse.in respoinse to each operation of thepLIsh button. Clock pulse frequencycan be 4 to 500 kcy/sec. The transistorelectronic cirCuit used is an integralpart of the switch with all componentssealed in a resilient potting material.(Minneapolis-Honeywell Regulator Co..Dept. Sci749, Freeport, Ill.)

l TELEMETRY DISCRIMINATOR uses thephase-lock technique to obtain goodiselectivity on each of 23 standard tele-metry channels. Sensitivity is 10 mvr.m.s. to 14.5 Kcy/sec and 70 mv r.m.s.at 70 Kcy/sec. Stability is said to be-+(.5 percent of bandwidth and linear-ity 0. 1 percent. Output is --+90 volts at-4-25 ma. Trimmnning potentiometers onthe front panel are used to adjust fre-quency range of each channel. Controlsinclude ouLtput gain, output zero, andbandwidth. (Hallamore Electronics Co..Dept. Sci758, 7/14 N. Brookhurst St.,An,aheim.i Calif.)* DIFFERENTIAL AMPl'LIFIER featuLres in-put resistance greater than 500 meg-ohms, voltage gain froni 2 to 50, andlinearity -+-0.05 percent. A mlechanicalchopper and silicon-transistor carrieramplifier are used. Output voltagerange is -+-5 volts. Power consumptionis 140 ma at 28 volts unregulated.(Dynamics Instrumentation Co., Dept.Sci759, 583 Monterey Pass Rd1., Mon-terey, Calif.)

* PliOTOCONDUCTIVE CELLS have powerrating of 0.5 watt when used with heatsink and 0.25 watt without heat sink.The type 504 is a cadmiumii selenidecell with relatively high speed of re-sponse; the type 505 is a cadmiumii sul-fide cell. Nominal resistances at a colortenmperature of 2870 and 2 ft-ca are1500 and 5000 ohms, respectively. Peakspectral responses are 5500 and 6900respectively. Dimensions are 2,) in. indiameter by 1/2 in. long. (ClairexCorp., Dept. Sci7f6l, 19 W. 26 St..New York, N.Y.)

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PURESTDISTILLED WATERAUTOMATICALLY. t0 0-00A -E- 0 E -

BARNSTEAD STILLYOU NEVER NEED CLEANBarnstead Steam Heated Stills with FeedbackPuiifier produce distilled water of from 800,000to 2,000,000 ohms electr ical resistance with totalsolids not exceeding .02 to .03 parts per million.Maintenance and up)keep completely eliminated.

FULL AUTOMATIC CONTROLSProvide full automatic operation with continu-ous supply of freshly distilled water. . . no atten-tion needed . . . Still is self-starting, self-flushingand self-stopping.

ULTRA VIOLET TANKWITH VENTGARD

Storage tank e(quipped with Ventgai-d whichprevents airborne contamination from enteringtank as water is dr-awn off. Ultra Violet lightnot only keeps bacteria from forming but alsokills any bacteria piesent.

PUROMATIC CONTROLLERSamples distilled water being produced and di-verts to waste water of substandard purity andcontinues to do so until condition has beenrectified.

TIN LINED PIPINGComplete line of Tin Lined Piping, Fittings andValves for distilled water distribution systems.maintaining purity to point of use.

NEW CATALOGSWrite for Catalog "G" describing Barnstead'scomplete line of Water Stills, and Catalog #160on Barnstead Demineralizers.

ifllariisteadSTILL AND STERILIZER CO.

49 Lanesville Terrace, Boston 31, Mass.BOSTONJAmaica2-8490CHICAGO

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* SCHERING BRIDGE manufactured byHartmann and Braun in Germanymeasures dielectric loss factor andcapacitance of grounded or ungroundedtest objects at high and low voltageand dielectric constant of solid andliquid insulating materials. The testobject is compared with a loss-freestandard capacitor by means of an a-cbridge. Measuring range for capacitanceis 3 pf to I Ousf and for loss factor2 X 010 to 1.1 1 1. Loss-free com-pressed-gas reference capacitors aresupplied. (Epic Inc., Dept. Sci738, 150Nassau St., New York 35, N.Y.)

* AUTOMATIC SAMPLE CHANGER is de-signed to handle up to 200 samples forradioactivity measurements. Models areavailable for gas-flow or scintillationcounting or for both. A feature of theinstrument in an automatic revertingcircuit that avoids excessive time forcounting low activities. Samples of nor-mal activity are timed for full pre-set count; low-count samples are timedfor a small fraction of the preset countand this reversion is recorded and iden-tified on the output tape. (TechnicalAssociates, Dept. Sci741, 140 W. Prov-idencia Ave., Burbank, Calif.)

* REFERENCE RADIOGRAPHS for inspec-tion of aluminum and magnesium cast-ings include 13 covering discontinui-ties in aluminum alloy castings and12 for magnesium alloy castings. Eachradiograph illustrates eight grades ofseverity for a particular discontinuity.Illustrated are gas holes, segregation,microshrinkage (both sponge and feath-er), and foreign matter. Each stand-ard is held in an 81/2 by 11 in. card-board frame. (American Society forTesting Materials, Dept. Sci747, 1916Race St., Philadelphia 3, Pa.)

* TEMPERATURE INDICATING LABELS pro-vide a change from pastel to black togive an irreversible record of exposureto heat. The labels are available in50°F steps. From 1000 to 500°F theyare offered in plastic casing and from500° to IlOOOF on stainless-steel foil.Both types are self-adhesive and aresaid to adhere until intentionally re-moved. (Pyrodyne, Inc., Dept. Sci751,c/o William Wahl Corp., 11973 SanVincente Blvd., Los Angeles 49, Calif.)

* RELAY TESTER measures pull-in anddrop-out voltage and current simulta-neously. Coil voltage is continuouslyvariable. Automatic driving circuitryprovides three repetition rates. Contactresistance and coil resistance are meas-ured by a built-in ohmmeter. Connec-tions are provided for oscilloscope dis-display. (Anaheim Electronics Divisionof Electronic Engineering Co., Dept.Sci755, 1601 Chestnut Ave., Santa Ana,Calif.)

* INFRARED SPECTROPHOTOMETER usesa prism-grating monochromator and aratio recording system in a two-fre-quency, dual-beam system with beamchopping ahead of the sample. Cellspace is over 10 in. long. Manufac-turer's specifications include the follow-ing: wave-member accuracy ±0.5 cm-';wave-member reproducibility +0.1 cm-';photometric accuracy +0.1 percent; res-olution 0.3 cm-' or better. Range is4000 to 450 cm-' by use of KBr prismand windows. Photometric scales of 0to 1, 0.5 to 1.5 absorbance, and 0 to100 percent transmittance are provided,as well as a compound scale and ex-panded scales. Spectra from 18 in. to150 ft in full-span length are recordedwithout gaps at order-change points.(Applied Physics Corp., Dept. Sci765.2724 S. Pack Rd., Monrovia, Calif.)

* CAPACITANCE INDICATOR uses a crys-tal-controlled oscillator to furnish 1.6Mcy/sec excitation to two matched,tuned circuits. One, the measuring cir-cuit, contains the capacitance beingmeasured; the other is a reference cir-cuit. Ranges are 0 to 200 pf on narrow-span setting and 0 to 2800 pf on widespan. Corresponding sensitivities are0.01 and 0.19 pf, respectively. Cali-brated accuracy is said to be ±2.0 per-cent. A + 10-volt variation of inputvoltage produces a +50°F +10 percentzero shift. The instrument is portable,measuring 1 1 by 12 by 6 in. andweighing 19 lb. (Foxboro Co., Dept.Sci764, Foxboro, Mass.)

* ROBOT CHEMIST is a modularized sys-tem for automatic chemical analysis.The operator is required only to loadsamples in a storage rack that holdsup to 100 samples. An index headperforms a sequence of operations oftypes depending on special-purpose sub-assemblies and determined by program-mer settings. Operations include pi-petting aliquots of sample, adding meas-ured amount of reagent, mixing, dis-carding sample, rinsing and drainingcontainer, rinsing and draining pipette.Samples are maintained at constanttemperature through operations. Anautomatic centrifuge loads, spins andunloads 12 samples in each cycle. Oper-ating sequence is varied by resettingswitches. Examples of analyses per-formed include amino acid chromatog-raphy, blood sugar by glucose oxidasemethod, serum lactic acid by dehydro-genese method. The system is compat-ible with standard laboratory colorim-eters, spectrophotometers, radiationcounters, pH meters, and so forth, (Re-search Specialties Co., Dept. Sci767,200 S. Garrars Blvd., Richmond,Calif.)

JOSHUA STERNNational Bureau of Standards,Washington, D.C.

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New ProductsJoshua Stern

DOI: 10.1126/science.132.3426.569 (3426), 569-576.132Science 

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