New ProductsThe information reported here is obtained from

manufacturers anid froml other sources consideredto be reliable. Neither Science nor the wvriter as-sumnes responsibility for the accuracy of the in-formation. A Readers' Service card for use Inmailing inquiries concerning the itenms listed isincluded otn pages 431 and 505. Circle the depart-menit numnber of the items in which you are inter-ested on this card.

* SEQUENTIAL GAS SAMPLER will auto-matically collect air samples for sub-sequent analysis of contamination. Inoperation a vacuum pump is connectedto a special 12-position valve, whichis connected to 12 gas collectors or

filter holders. The valve is automatical-ly switched from one position to thenext so that 12 samples of air are

collected in sequence, and then thesampler shuts itself off. The operatingsequence of the sampler is controlledby a dial-adjusted timer. The basiccycle time is set by moving one of twodials to the time desired. The seconddial controls the operating time of thepump. Thus, by adjusting the dial ar-rangements, the sampler can be pro-grammed to sample 10 min every 2hr. Sampler may be used with filterholders for collecting dust samples; gas

samples can be collected in midgetcharcoal traps. Refrigerated traps canalso be used. (Gelman Instrument Co.,Dept. Sci8 1, P.O. Box 86, Chelsea,Mich.)

* PORTABLE OSCIL LOGRAPH (Fig. 1),available in a choice of 6, 12, or 18channels, uses a push-button controlledtransmission to provide record speedsof 0.25, 1.0, 4.0, 16.0, and 64.0 in./sec.Any speed may be selected while themotor is running without interruptingthe recording operation; writing speedsup to 50,000 in./sec are obtainable.Grid lines are provided in either 0.1-in.or 1-mm increments; trace width is0.01 in. Records are provided by a

printout process, and no record maga-

zine is required; record capacity is 200feet. (Consolidated ElectrodynamicsCorp., Dept. Sci98, 360 Sierra MadreVilla, Pasadena, Calif.)

* SPECTROPHOSPHORIMETER permits ex-

citation of compounds and measure-

ment of resulting phosphorescencethroughout the ultraviolet and visibleregions. Decay curve of the phos-phorescent state is measured by an

x-y recorder with time-base generatoror an oscilloscope. Phosphorescencespectra are used for identification ofcomponents in compounds of unknowncomposition or for quantitative analy-sis of phosphorescent compounds. Theinstrument will also measure fluores-cence with an accessory attachment.(American Instrument Co., Dept. Sci-82, 8030 Georgia Ave., Silver Spring,Md.)17 FEBRUARY 1961

* AUTOMATIC RECORDING MICRODENSI-TOMETER consists of a traveling-stageprojection microscope with a multiplierphototube for measuring the light inthe projected image. An adjustablelimiting aperture is located immediate-ly in front of the phototube. Area ofthe sample illuminated can be adjustedto match reading aperture to reducestray light. Standard microscope opticsare used; reflection optics as well astransmission components can be used.Full-scale sensitivity is 0 to 4.0 densityin reading areas as small as 201Y2.The stage is driven through a mi-

crometer system by an electricallyselected gear train; total scanning travelis 25 mm. Samples are mounted onstandard microscope slides. A strip-chart recorder plots density againsttravel as the sample is scanned. (Ansco,Dept. Sci84, Vestal Parkway E., Bing-hamton, N.Y.)

* HIGH FREQUENCY CURRENT PROBE(model P 6016) and type 131 amplifierconstitute a current detecting systemfor use with a wide-band oscilloscopefor observation and measurement ofcurrent waveforms of low amplitudeand fast rise time. Current range is 1ma to 10 amp. Pass band with a 30Mcy/ sec oscilloscope is 50 cy to 17Mcy/ sec. When used with passivetermination, the probe permits measure-ment at frequencies to 20 Mcy/sec andsensitivity of either 2 or 10 ma/ mv. Inoperation the probe slot is placed overthe current-carrying conductor, andthe magnetic circuit is closed by a slide.Loading introduced is said to benegligible. (Tektronix, Inc., Dept. Sci-83, P.O. Box 500. Beaverton, Ore.)

* PHOTOELASTIC ULTRASONIC DELAYLINES operate by detecting an acousticsignal in the solid transparent delay lineby optical means. The optical systemconsists basically of a light source, apolarizer, a birefringent phase-delayplate, a viewing slit, an analyzer, anda multiplier phototube. The delaymedium used is a bar of pure fusedsilica; delays up to 160 Lsec at fre-quencies up to 30 Mcy/sec have beenachieved. Continuously variable delayis made possible because output can betapped at any point along the mediumwithout loss of signal. (Corning GlassWorks, Dept. Scil01, Corning, N.Y.)

* REMOTE POSITIONING DEVICE (Fig. 2)for small laboratory apparatus or instru-ments in radiation environments is 26 in.high, and its base diameter is 9 in.Mounting rods and a platform forbeakers or flasks are provided. Verticaland rotary motions are controlled bytoggle switches. Rotation is unlimitedin either direction. (Nuclear Ohio, Inc.,Dept. Sci58, 27105 Knickerbocker Rd.,Bay Village, Ohio)

Fig. 1. Portable oscillograph.

* ULTRASONIC DISPERSER, designed pri-marily for preparation of dispersionsfor electron microscopy, comprises twoultrasonic generators and transducers,1 and 3 Mcy/sec, respectively, housedin a common cabinet. Samples placedin the excitation cell are dispersed in-stantly into a fog that can be collectedon a diaphragm or grid for examina-tion. The instrument operates on a 50or 60 cy/sec, 110 to 145 volt a-c line;power consumption is 150 watts. Brink-mann Instruments, Inc., Dept. Sci65,115 Cutter Mill Rd., Great Neck, N.Y.)

* REFERENCE-CURRENT SOURCE pro-vides 12 currents of either positive ornegative polarity over the range from 1ma to 3 na with accuracy said to be-+- 1 percent. Source of current is- a3.4-volt mercury cell in combinationwith precision resistors. (Elcor, Inc.,Dept. Sci67, Falls Church, Va.)

* SPECTRUM ANALYZER operates in realtime covering the range 5 to 1000cy/ sec. Resolution for 3 db is 6.5cy/ sec, and 40 db band width is 60cy,'sec. The spectrum is displayed on a5-in. oscilloscope every 1/5 sec. Theinstrument is a delay-line synthesizedFourier analyzer. (Federal ScientificCorp., Dept. Sci86, 615 W. 131 St.,New York 27, N.Y.)

Fig. 2. Remote positioning device.

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. K.e4.i mT.4?EI .1. I m.-.r.i K1 mliii.It; AVR. .-

CHEMOSTAT. . . a continuous,automatic culture apparatus forgrowing microorganisms withcontrolled density and growthrates. Full control is offered byvariation of growth factor in nu-trient and a timer that feeds nu-trient at selected rates. Completewith control cabinet and all glass-ware. Single unit, $355.00. Dou-ble unit, $575.00.Ask for Chemostat Bulletin S.METABOLISM CAGE . . . forcarbon-14 tracer studies in ratsand mice. The only available ap-paratus for total control of inputand collection for metabolic proc-esses. Unique method separatesfeces and urine . . virtually totalabsorption of C02. Complete sys-tems in 3 cage sizes; 31/2" for mice,$252.25; 6" for rats, $298.25; 8"for guinea pigs, $350.00. Ask forMetabolism Cage Bulletin S.

FAT EXTRACTOR (Wistreich) for rapidmoisture and fat determination. Reduces24-hour task tb 3 hours (proven againstAOAC method, correlation coefficient.99). Apparatus includes reflux con-denser, receiver arm and special 780 mlflask with two compartments arrangedso solvent returns from condenser di-

cilmarvSCIENTIFIC LABORATORIES317 MADISON ST., MAYWOOD, ILL.

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Operation is amazing-ly simple, as you can see!

U'y Anyone in the lab canbecome an expert pipet.ter, safely, with less thana minute's practice.* For right or left hand

_* Two sizes, Standard and MicroNo. S 341-80 Clinac "Stand-ard' Pipetter, each.. $15.00

w _ No. S341-82 Clinac "Micro"Pipetter, each ...... 12.50

For micro pipettes andblood diluting pipettes

LAPINE SCIENTIFIC COMPANY6001 South Knox Ave., Chicago 29, Illinois

In The East: Lapine Scientific Co. (New York)Irvington-On-Hudson * New York

534

rectly to inner compartment. On com-pletion of the process, fat has collectedin the graduated receiver, solvent is inthe inner flask cell and moisture hasbeen dissipated or collected. Price com-plete . . . only $75.00 each. For fulldetails, ask for Fat Extractor Bulletin S.

Modern glassware systems forvacuum, distillation, specialpurposes; plus accessories,tools, gauges, valves, etc. Write

for Catalog 60-DS4 INSTRUMENTS, INC.

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glassware cleaning problem!* in 1/30/0 to -1/2% solution-is safe, effec-tive, economical * dissolves blood, tissuemucus and other soil on immersion alone* will not etch glass, rust metal, harmplastics * specifically formulated for lab-oratory and hospital use

Costs just a few pennies per gallon

0. 0

MEINECKE & CO., INC . s i=o225 Varick Street, New York 14

* FREQUENCY TRANSLATOR filters andconverts the audio spectrum into fre-quency bands that can be examined in-dividually and simultaneously with ahigh degree of resolution. Thirty fiveunits are assembled into two racks toprovide for the selection and translationof 35 segments, each 140 cy/sec wide,falling between 150 and 5000 cy/sec.An input filter unit is provided for eachset of five channels as a means of re-jecting particular spectrum portions. Itis possible to add or subtract channelsindividually or in groups of five. (RixonElectronics Co., Dept. Sci27, 2414Reedie Ave., Silver Spring, Md.)

* STROBOSCOPIC ILLUMINATOR featuresflashing rate of 110 to 25,000 perminute in three ranges with flash dura-tion i to 6 /sec. Peak intensities offlashes are 0.21, 1.2 and 4.2 Mca, re-spectively, on the three ranges. Single-flash intensity is 7 Mca peak. The lightsource is housed in a parabolic reflectordesigned to swivel around the lamp.Accuracy is said to be +1 percent ofreading after calibration on the middlerange. Calibration may be performedagainst power-line frequency by makingtwo screwdriver adjustments. (GeneralRadio Co., Dept. Sci31, West Concord,Mass.)

* MULTIMETER enables increments ofany range to be expanded about anypoint in the range and displayed on anexternal servo recorder. The instru-ment combines a Simpson multimeterwith a suppressor power supply and anattenuator. A 5-mv-sensitivity externalservo recorder will permit expansionsto ±+ percent of full-scale value. Theattenuator permits the expansion to beadjusted to any value from 1 to 100percent. (Tensor Electric DevelopmentCo., Dept. Sci88, 1873 Eastern Park-way, Brooklyn 33, N.Y.)

* PEAK-READING VOLTMETER is designedto accept and display the peak values;within specified limits, of any positivetransient voltage pulse of arbitraryshape. The instrument will detect apeak voltage and initiate readout whileblocking further input signals until itis reset. Readout is provided directly involts as a four-digit decimal value withaccuracy said to be ±+1 percent.(Curtiss-Wright Corp., Dept. Sci90,P.O. Box 8324, Albuquerque, N.M.)

* GAS-VELOCITY METER measures thevelocity of luminous, hypersonic gasflow by observing the luminosity fluctu-ations in the flow. These fluctuationsare converted into amplitude variationsof electrical signals by two multiplier-phototube transducers spaced 1.2 in.apart. The phase difference betweenthe outputs of the transducers is com-pensated by a calibrated variable

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magnetostrictive delay line that pro-vides indication of the time requiredfor the luminosity variations to travelthe distance between the transducers.Velocities are measured over a rangeof 2000 to 50,000 ft/ sec. The metermay also be used to measure vibrationfrequency or motion as a function oftime. (MHD Research Inc., Dept.Sci80, P.O. Box 1815, Newport Beach,Calif.)

* RECORDING SYSTEM combines directwriting and photographic oscillographicrecording to cover the broad range offrequencies encountered in physiologi-cal recording. The direct-writing por-tion of the system covers events in thed-c to 100 cy/ sec range. The photo-graphic section, using optical galvanom-eters, provides frequency response to500 cy/sec. The multichannel systemmakes use of interchangeable plug-inamplifiers that are compatible with bothtypes of recorders. (Sanborn Co., Dept.Sci66, 175 Wyman St., Waltham 54,Mass.)

* TRANSDUCER EQUALIZER is essentiallyan analog computer that overcomes thelimitations of transducer measuring sys-tems by inserting into the data a com-plex transducer function that is thereciprocal of the transducer transferfunction. The device is said virtually toeliminate undesirable ringing, which re-sults from the excitation of the trans-ducer at or near the natural resonantfrequency, and to extend effectively thesystem's frequency response by severaloctaves. It can be employed as a singleor dual system to compensate fortransducer or electrical systems withone or two degrees of freedom. Inputimpedance is 20,000 ohms shunted by20 pf; output impedance is less than1000 ohms. Input signal is nominally±5 volts at gain of 1; output signal is±15 volts maximum; gains of 1, 2, 5,and 10 are provided. Pulse response issufficient to equalize pulses with risetimes as short as 0.5 /usec. (Telecomput-ing Corp., Dept. ScilOO, 915 N. CitrusAve., Los Angeles, Calif.)

* VIBRATION ANALYZER is a fully auto-matic system that performs on-linespectral density analysis of dynamicdata. Analysis is performed over aband width of 5 kcy/sec with resolutionof 50 cy/sec. Energy distribution isencoded at a rate of 5000 readings persecond and recorded on 1/2-in. magnetictape. The entire spectrum is swept andencoded every 20 msec or on com-mand. An additional unit monitors anyselected group of frequencies and warnswhen amplitude approaches or exceedsa preselected value. Accuracy is said tobe better than ±+1 percent. (Communi-cations Control Corp., Dept. Sci89,14707 Keswick St., Van Nuys, Calif.)17 FEBRUARY 1961

A Mousellanyof Animal Care

DevelopmentsThey Said It Couldn't Be Done

Econo-Cage #27, LID #22D

The new Polycarbonate Econo-Cage #27is clear, autoclavable and unbreakable.

To operate most efficiently animal colo-nies must use cages which withstand therough and tumble of mechanized wash-ing systems and the high temperaturesat which these systems and autoclavesoperate. Because colonies must be in-spected quickly, cages should affordmaximum visibility. Until now the cageswere either transparent or durable, butnone had both characteristics.

The new Polycarbonate combines theoptical and thermal properties of glasswith an impact resistance unmatched byany other clear material. A good exampleof the degree of impact resistance wasfurnished by a doubting Thomas whocould not break the cage by dropping itout of a fourth floor window. Polycar-bonate retains this remarkable strengthfrom 275° F. to -40' F. It is the firstclear plastic which can be autoclavedrepeatedly.

This new material, a linear aromaticpolyester of carbonic acid, has a verylow absorption level. Odor producinggases are not absorbed, resistance tomost acids and basics is very good.

The cage is constructed to N I H Spec.EG-84. For housing mice, the cage is11½"/' x 71/2" x 5" deep. The cages nestfor easy storage.

This is one of the "20 Series" of Econo-Cages, which includes cages of fibreglass, acrylonitrile-styrene-copolymer,polypropylene and polycarbonate. Theseare all 11/2" x 71/2 " x 5" deep. There arefour lid styles which are interchangeableon all "20 Series" cages. Write for com-plete information on this series.

Working With Restraint

Two new pieces of animal restrainingequipment are now available from theEcono-Cage Division of Maryland Plas-tics, Inc. A small restrainer for miceweighing from 10 to 40 grams (Econo-Cage #88), and a large unit for rats andhamsters weighing from 250 to 600grams (Econo-Cage #91 ), are new addi-tions which supplement Econo-Cage #90for 150 to 300 gram rats and hamsters.

These clear acrylic plastic units affordrapid and safe immobilization of ani-mals, easy access and maximum visibilityof animals in restraint. Econo-restrainersprevent unanesthetized animals from at-tacking tubes, cannulae, and other fix-tures; provide extended housing duringnutritional studies; restrain animals dur-ing administration of intravenous, intra-peritoneal, intramuscular, and subcu-taneous injections; and are useful foradministering intravenous fluid drips andanaesthetic.

All three sizes have an adjustable tail-gate which fits into any of three slotsto vary cage length, confine the animal,and serve as a cage door. Openings atthe top, bottom, and tail provide easyaccess to any part of the animal (thebottom slot also permits drainage ofanimal waste). A hopper permanentlyattached to the front of the unit includesa trough for granular feeds and a watertube inlet.

The small restrainer, Econo-Cage #88,can be varied from 2" to 3½"/2' in lengthand is 1 ¼/4" wide. The medium restrainer,Econo-Cage #90, can be varied from41/2" to 6" in length and is 2½"/2' wide.The large restrainer, Econo-Cage #91,can be varied from 5" to 7" in length andis 3" wide. All these units can be cleanedchemically or with hot water, they arenot autoclavable.

[ ECONO-CAGE DIVISIONe c o n o MARYLAND R.LASTICS, INC.c a g e 9 East 37th Street,New York 16, N. Y.

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* DIFFERENTIAL D-C AMPLIFIER hasboth input terminals isolated from bothoutput terminals and all four terminalsisolated from ground. The unit ampli-fies low-level signals from d-c to 20kcy/ sec at all gain settings. Gain iscontinuously adjustable from 10 to1000 with zero position. Input im-pedance is 100 kohm. Common moderejection is said to be 130 db to 100cy/sec. Output is ±10 volts at ±20 maor +5 volts at ±30 ma. (ComputerEngineering Associates, Inc., Dept.Sci76, 350 N. Halstead, Pasadena,Calif.)

* PUNCHED-TAPE VERIFIER AND DUPLI-CATOR handles one through eight chan-nels in any code structure at 60 charac-ters per second. In verifying, the devicestops automatically upon discovery oferror and displays error in neon indica-tors simulating bits. Failure to verifystops the duplication function withoutpunching an erroneous character. (Tal-ly Register Corp., Dept. Sci72, 1310Mercer St., Seattle 9, Wash.)

* GLASSWORKING LATHE can be changedfrom horizontal to upright position in2 min or less, according to the manu-facturer. Length between chucks is 36in.; radial clearance, 8 in.; chuck ca-pacity, 8 in.; through-spindle diameter,4 in. Chuck adjustment does not re-quire a key; the tailstock can be lockedwhile the headstock rotates for flaringoperations. A synchronous switch stopsthe motor when the clutch is disen-gaged; hence the motor cannot be leftrunning accidentally. (Bethlehem Ap-paratus Co., Dept. Sci75, Hellertown,Pa.)

* PERFORATED-TAPE RECORDER consistsof a tape-transport mechanism, a tran-sistorized electronic circuit, power sup-ply, and housing. Inputs are convertedto serially encoded pulse trains. Thepulses are recorded by incineration ofsmall holes in a paper tape, with thehole pattern representing the informa-tion recorded. Maximum operatingspeed is 180 decimal digits per minute.An associated tape reader operates at1200 decimal digits per minute. (Ad-vanced Instrument Corp., Dept. Sci26,700 S. 4 St., Richmond, Calif.)

* PHOTOELECTRIC TAPE READER readsblocks of up to 80 bits simultaneouslyat speeds up to six blocks per second.Stop code can be provided either by ex-ternal equipment or by any desired holein the matrix. Use of the sprocket holeas a stop signal results in conventionalline-by-line operation. (PhotocircuitsCorp., Dept. Sci32, 31 Sea Cliff Ave.,Glen Cove, N.Y.)

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

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New ProductsJoshua Stern

DOI: 10.1126/science.133.3451.533 (3451), 533-536.133Science 

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