New Products - Sciencescience.sciencemag.org/content/sci/133/3464/1619.full.pdf · ard liquid sample nebulizer. To per-form an analysis, a liquid sample is atomized in the flame burner

New Products

* AUTOMATIC PARTICLE COUNTER ANDSIZER (Fig. 1 ), manufactured by Ca-sella Electronics Ltd., sizes and countsa wide range of materials either on astandard 3- by 1-in. slide or in a liquidcounting chamber. An image of theparticles is projected onto an adjustableslit by a conventional microscope sys-tem. The sample is mechanicallyscanned past the slit, and the signalsproduced by the image of the particlepassing over the slit are recordedelectronically. Particle size range is1 to 200 pt. A particle crossing theslit produces a voltage pulse of ampli-tude proportional to the extent towhich the slit is obscured. The recipro-cating stage on which the specimen ismounted allows the scanning slit to belocated on the optical axis of the micro-scope. The filament-lamp illuminationgives high-intensity and uniform il-lumination by the Kohler system. In-tensity is sufficient to provide a goodsignal-to-noise ratio for slit sizes lessthan 1 A wide.The number of particles per unit

area is obtained by scanning thespecimen twice with two slits of dif-ferent widths but constant sensitivity;"sensitivity" means the length of slitthat must be obscured for the particleto be counted. The size distribution ofparticles is obtained by differentiatingthe curve of the proportion of particleshaving sizes greater than specified sizes.

Compensation for variations in opa-city of the materials being countedis provided by a gain control. Insteadof using the particles themselves toadjust for this compensation, a drumcarrying a series of neutral densityfilters is provided for use once theoptical density of the specimen hasbeen determined.

Scanning is automatically performedin two series of 100 passes that bringthe specimen back to its starting pointbut on a slightly offset track. Eachtraverse is 10 mm long, and the dis-tance between tracks is 50 f. The totallength swept out in this way is 200 cm.

The information reported here is obtainied frommnaniufacturers anid fromn other sources conisider-edto be reliable. Neither Science nzor the writer as-sumes responisibility for the accuracy of the in-formtationi. A Readers' Service card for use inmnailing inquiries conzcerning the itemits listed isinicuded onz pages 1537 anid 1627. Circle thetiunuber of the itents in which you are initerestedonz this card.

19 MAY 1961

Models are available with up to fiveamplitude discrimination channels. Theuse of the multichannel instrument per-mits a corresponding reduction in thetime necessary for accumulation ofdata required to define a size distribu-tion. (Cooke, Troughton and Simms,Inc., 91 Waite St., Malden 48, Mass.)

Circle 1 on Readers' Service card

* FLAME ABSORPTION SPECTROMETER iSa double-beam instrument with an auto-matic readout system for the range 2000to 7700 A. The instrument includes ahollow-cathode lamp source, a sourcepower supply, double-beam source op-tics, a monochromator equipped withgrating, a detector unit with two multi-plier-phototube detectors, and associatedelectronic equipment. Sampling is doneby a standard burner with preset regu-lator, equipped with accessories forburning acetylene, propane, natural gas,or manufactured gas, and with a stand-ard liquid sample nebulizer. To per-

form an analysis, a liquid sample isatomized in the flame burner. Lightfrom the hollow-cathode source, whichmust emit the spectrum of the metalbeing analyzed, crosses the flame and isfocused on the entrance slit of themonochromator previously set to readthe intensity of the chosen spectral line.The degree of absorption of the sourcelight by the flame is a function of theconcentration of the metal in the sam-ple. Typical sensitivities (in jug/ ml)quoted by the manufacturer are: cal-cium, 0.1; magnesium, 0.03; copper,0.02; zinc, 0.1; cadmium, 0.1; and iron,0. 1. (Perkin Elmer Corp., Norwalk,Conn.)


* DESALTER for removal of inorganicsalts from laboratory solutions prior tochromatographic separation uses ion-exchange membranes. The device in-cludes transformer, half-wave rectifier,potentiometer, and three compartmentsseparated by ion-exchange membranes.The central compartment has a totalcapability of 6 ml; it is divided intocells of 1, 2, and 3 ml. Outer compart-ments contain platium-clad electrodes.(Torsion Balance Co., Clifton, N.J.)


* SEQUENCE REMOTE CONTROL SYSTEMcontrols the operating time of camerasplaced along missile ranges to collectdata on test drone flights. The fully

Fig. 1. Automatic particle counter and sizer.

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s m aller al.. g ht

smaller andlightereven morecompact!WITH ...

* Accuracy to + 0.01° C.* Range 0-1000 C.* Pumps to 21/2 G.P.M.* Magnetic Temperature Setting* Double Transistor Relay* Brushless Motor

WRITE US FOR COMPLETEINFORMATION & NAME OF YOUR

LOCAL BRONWILL DEALER

275 NORTH GOODMAN STREETROCHESTER 7, N. Y.

solid-state system is comprised of a

console that programs information tolaunch the drone and to operate any

number of cameras in time sequence.

This is achieved by presetting a decadecounter to the countdown time whileadditional counters are set to the startand stop times for each camera. Alltiming is visually indicated, and provi-sion is made for overriding the pro-

gram (Telemetrics, Inc., 12927 S. Bud-long Ave., Gardena, Calif.)


* DATA CONVERTER (Fig. 2) extracts datafrom punched tape and writes it on

magnetic tape. Conversion of the datais acconiplished so that input and out-put data are completely identical; theoutput record is a bit-for-bit inmage ofthe input tape. A universal code con-

version feature is available at extracost. The system will accept paper, foil,or plastic tapes in widths of five toeight channels. It can write on mag-

netic tape in fornmats compatible withthe IBM 727 and 729 niodel I andRemington Rand computer inputs. Thesystem includes a paper tape readercapable of reading 120 characters per

second, a magnetic tape handler, andnecessary electronic circuitry for con-

trol and tape format. (Tally RegisterCorporation, 1310 Mercer St., Seattle,Wash.)


* ELECTRONIC MUL.TIPI,IER offers single-quadrant multiplication and squaringwith accuracy said to be 0.01 percentand four-quadrant multiplication ac-

curacy of 0.05 percent of full scale.Units are available with two, four, orsix channels. Inputs are four inde-pendent voltages (Xi, yi, X} and y2)in the range of + 100 volts. Outputs are

two independent products (-0.01Xiyi and -0.01 x2y2) in the rangeof + 100 volts at 10 ma maximum loadcurrent. Specifications quoted by themanufacturer include: drift, less than100 mv over an 8-hr period; noise,less than 100 mv, peak: phase shift,less than 1 deg at 100 cy/sec; zero error,with one variable at zero and the otherranging over 100 volts, maxinium 40mv. No external power supplies are

required for operation with analogcomputing equipment. (Donner Scien-tific Co., 888 Galindo St., Concord,Calif.)


* OPTICAL LEVEL (Fig. 3) manufac-tured by Hilger and Watts maintains a

level line of sight even when its tele-scope is tilted. The self-leveling deviceconsists of a fixed prism rotating abovetwo swinging prisms. When the tele-scope is tilted, the suspended prismschange their relation to the axis of thetelescope to maintain a level line of

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Fig. 2. Data converter.

Fig. 3. Optical level.

Fig. 4. Micromanipulator.

Fig. 5. Integrating strip-chart recorder.

SCIENCE, VOL. 133

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sight. Repetitive setting action is saidto be closer than 1 sec of arc. Oscilla-tion of the prisms is prevented by anair-damped piston that also limits swingto ±20 min of arc. The instrumentreads directly to 0.001 in. over 1/2 in.Focusing range is 6 ft to infinity. (EngisEquipment Co., 431 Dearborn St.,Chicago 5, 111.)


* MICROMANIPULATOR (Fig. 4) is madeup of three independent traversing unitsthat may be assembled in any desiredcombination. Advance of each unit iscontrolled by a knurled knob directlycoupled to a spring-loaded frictionwheel that tracks in a groove in themanipulator body. Fine and coarse posi-tioning are independent for eachtraverse. Motion range is 0 to 125 mm,and sensitivity is said to be 10 /i. Ma-terials of construction are stainless steeland chrome-plated bronze; the entireunit may be autoclaved. (Process & In-struments, 15 Stone Ave., Brooklyn33, N.Y.)


* RECORDER-PEN PROGRAMMER, for re-

corders using solenoid operated pen-lift machanisnis, operates the pen lift infive distinct code patterns for traceidentification. The programmer is spe-

cifically designed for use with antennapattern recorders and x-y recorderswhen niultiple recordings on the same

chart are desired. (Scientific-Atlanta,Inc., 2162 Piedniont Rd., NE, Atlanta9, Ga.)


* INTEGRATING STRIP-CHART RECORDER(Fig. 5) provides five different maxi-mum count rates, obtained by an ad-justable gear system, up to a maximumof 40,000 area counts per minute.Counting rate linearity is said to be-+- 0.5 percent of full scale. The in-tegrator channel, installed as a secondchannel in a standard single-channelrecorder, consists of a potentiometer-amplifier-servo arrangement and actu-ates an area trace simultaneously withthe signal trace. Between each peak or

at the start of each integration, the in-tegrator pen may be reset to eithermargin. The integrating circuit may beset to any assumed zero point in thespan of the recorder signal. (Texas In-struments, Inc., 3609 Buffalo Speed-way, Houston 6, Tex.)


* MERCURY-VAPOR METERS are offeredin three models. Model 21 is a single-range analyzer operating from 0.03 to3 mg/ n-. For operation, the instru-ment is adjusted to zero in an areaknown to be free of vapor. Model 23is a dual-range instrument with ranges0.005 to 0.1 mg/m' and 0.03 to 319 MAY 1961

Optically and mechanically, the M-5 offers unequalled precision, con-venience and versatility for the most diverse research applications.Uniform, maximum sharpness throughout the field, with no change inaccommodation, is one of the many exclusive features of the instrument.With a constant working distance of 96 mm., standard magnificationsare 6x, 12x, 25x, and 50x, conveniently selected on the rotatable horizon-tal drum. Using 8x, lOx, 15x, and 20x eyepieces and attachment objec-tives, a total power range of from 5x to 200x is obtainable. Accessoriesnot illustrated include other wide field eyepieces, various light sources,stages and polarizing, photographic and measuring attachments.Your own evaluation of this superb stereomicroscope will prove mostrewarding. Write for Booklet M-5.

'-the FIRST name in a complete line of Surveying Instruments,Photogrammetric Equipment and Microscopes.

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3~~~~~A

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This completely new concept, de-signed especially for laboratory use,makes wash bottles easier to cap anduncap, easier to fill, easier to dis-pense from. Safer, too, becausethey're proof against acids and alka-lis and never leak a drop. Anotherstep in Nalge's continuing programof product improvement throughplastics research. 125, 250, 500 and1000 ml., all with standard closures.Ask your laboratory supply dealer.Write Dept. 2 15 for Catalog SheetN-15.

THE NALGE CO., INC.ROCHESTER 2, NEW YORK

The Quality Standard of Plastic Laboratory Ware

mg/m3. The instrument uses two photo-tubes in a bridge circuit with internalstandards to eliminate the need forexternal calibrating devices. Model 24.similar to model 23, features an audioalarnm; alarm concentration is adjust-able over the entire range of the in-strunient. All niodels operate on 11 5-volt a-c. (Beckman Instruments, Inc..2200 Fullerton Rd., Fullerton, Calif.)

Circle I I on Readers' Service card

* SAMPLING VALVE (Fig. 6) for chro-matographs or mnass spectographs has2 intake ports connected to a comIl-mon vacuum chamiber. Each valve issealed by a spring-loaded ball exceptat the time the port is open for s.alIm-pling. A cam controls opening andclosing of each port by moving a rodthat unseats the ball. A 3-sec electricalpulse actuates motioni of the valvefroml one position to the next. Thevalve detents to a new position in 10sec. (Gelmnan Instrumnent Co.. 106 N.Main St., Chelsea. N/ich.)


* POTENTIOMETER is a four-dial, six-fig-ure, dual-range d-c instruliment with atotal range of 2.101010 volts. Themanufacturer guarantees accuracy of±-0.001 percent for a period of 5years, initial adjustnient within-0.0002 percent, stability within-+ 0.00015 percent per year, thermalelectromiotive torces less than 0.1 avyand resolution of 0.1 1,v. The potenti-ometer also ftunctions as a resistancecomparator accurate to two parts permillion and a saturated-standard-cellcomparator that will detect differencesof 1 1,v. (Sensitive Research InstrumentCorp., 310 Maini St.. New Rochelle,N.Y.)


* TRACKING FILTER is designed to im-prove the signal-to-inoise ratio of Dop-pler signals by reducing circuit band-width. The device is in efTect a band-pass filter whose center frequency aUtO-matically tracks the Doppler signal fre-qulency. The tracking bandwidth is ad-julstable over a wide range by means ofa front-panel control even while track-ing is being performied. Input trequencyrange is 100 to 20.))000 cy/ sec; inputsignal level is approximiiately 3 volts(r.m.s.); tracking bandwidth is acljust-able to 1.0. 2.5, 5.0. 10. 25, or 50cy/sec. (Interstatte Electronics Corp..707 E. Vermont Ave., Anaheim, Calif.)


N X-RAY IMAGE INTENSIFIER produces animage said to be 3000 times brighterthan that available on a conventionalfluoroscopic screen. The system accom-modates 16- and 35-mmil motion-pic-ture cameras or still cameras, eitherin conibination with television or sepa-

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Fig. 6. Sampling valve.

rately. These cameras can be used inconjuLnction with direct viewing. AnaLltonmatic brightness control maintainsconsistent brightness levels when view-ing or quickly scanning objects ofvarying density and thickness. Allphotographic-exposure factors are auto-matically compensated, so the opera-tor has only to push a button torecord photographically. The intensifiercan be used with x-ray generators atvoltages up to 250 kv. (Tracerlab In-dustrial Division. 1601 Trapello Rd.,Waltham, Mass.)

Circle 15 oll Readers' Service card

* RESISTANCE THERMOMETERt uses ahermetically sealed platintlim resistanceelenient to sense temperature. 1The sen-sitive element is 0. 1 38 in. in diiiameterand 0.4 in. long. P'recision of the sensoris said to be better than --().05 ohnmor + 0.05 F; mnieasurenient range is-100' to --+400°F; linearity deviationis said to be less than I percent of fullrange. Nominal resistance is 470 ohmsat 32 F; tinie constant is 2 sec in mov-ing liquid. (Nlinco 1Products. Inc., 740)Washington Ave. N.. Minneapolis I.Minn.)


* MAGNETIC MATERIAL SEPARATOR (Fi.7) achieves efficient separation by pre-venting the trapping of nonmagneticparticles within agglomerates of mag-netic particles. The nmixtLire to be

Fig. 7. Maignetic material separator.

SCIENCE, VOL. 133



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ISOTOPES

for YourDevelopment Work

Oak Ridge National Laboratory offersmore than 300 radioactive and stableisotope products.

RADIOISOTOPESProcessed Solutions-90 processed ra-dioisotopes may be obtained, includingmany carrier-free and high specific activ-ity products.Now Available -Iridium-192 gamma

sources with specific activity up to 100curies per gram, and cobalt-60 radiogra-phy sources 1/8 and 1/16-inch in diame-ter with specific activity greater than100 curies per gram. At a reduced price,carbon-14 barium carbonate is availableat $9.50 per millicurie.

STABLE ISOTOPESMore than 200 stable isotopes availablefrom 50 elements.... Chemical processingand target fabrication services also of-fered.... Ultra-high isotopic purity in anumber of isotopes.For information or literature, write to:Isotopes Division, Oak Ridge NationalLaboratory, P. 0. Box X, Oak Ridge,Tennessee.

separated is fed down a vibrating chutethat is inclined sideways as well as for-ward. An alternating magnetic field isused. Several times in each second themagnetic field is switched off for a fewcycles which allows time for the verticalagglomerates to collapse, releasing thenonmagnetic particles and allowingthem to migrate toward the lower sideof the chute. The magnetic particles are

kept toward the higher side by the non-

uniform magnetic field that is producedby a current of several hundred am-

peres flowing in accurately spaced rodsthat are parallel to the chute. A dividernear the lower end conducts the frac-tions to separate receptacles. (S. G.Frantz Co., 121 Kline Ave., Trenton6, N.J.)


* THICKNESS-MEASURING INSTRUMENT

measures the thickness of organic andother nonmagnetic coatings on iron andsteel. The instrument operates on themagnetic-amplifier principle. The meas-

urement is performed by applying a

two-pole probe to the surface and read-ing a meter deflection. Hardened beryl-lium copper foils are furnished for cali-brating the instrument. Four probes are

available with pole separations from5/32 to I in. for thicknesses up to 3/4in. An attachment for applying theprobe at constant pressure when meas-

uring soft materials and wires of smalldiameter is available. (Twin City Test-ing Corp., Tonawanda, N.Y.)


* MICROTOME CRYOSTAT provides formounting a rust-proof microtome in theevaporator. The drive wheel of themicrotome is mounted on the outsideof the cryostat so that the operator ex-

poses his hands to the low temperatureonly when introducing or removing thetissue sample. Temperature is main-tained between -10° and +20°C. Theunit may be operated with the cover

open. (International Equipment Co.,1284 Soldiers Field Rd., Boston 35,Mass.)


* PULSE GENERATOR features rise timesof 0.3 nsec, minimum pulse width of0.7 nsec, and built-in calibrated widthsof 5, 10, and 20 nsec. Other pulsewidths can be produced with lengths ofcoaxial cable used externally. Repeti-tion rate is variable from 20 to approxi-mately 300 per second. Pulse generatoris a coaxially mounted mercury-wettedswitch with an adjustable damping vane

for adjustment of undershoot and over-shoot. (Lumatron Electronics, Inc.,New Hyde Park, N.Y.)

Circle 20 on Readers' Service cardJOSHUA STERN

National Bureau of Standards,Washington, D.C.

19 MAY 1961

Nalgon®9?1.ASTIC TUBING

There's no guessing aboutwhat's going on inside Nal-gon tubing. You can see it!Because Nalgon is a specialformulation of highest gradepolyvinyl chloride and spe-cial plasticizers, without ex-tenders or fillers. Its water-clear transparency lets youcheck flow, color, turbidity,density, at a glance.But that's not all. OtherNalgon features - signifi-cant to industry, labora-tories, hospitals - include:acid resistance, strength,flexibility, non-toxicity, lowcost*, complete line of 40sizes. Try it yourself.Write Dept. No. 215N fordata and sample.*' I.D. coats less than 15c per foot.

A PRODUCT

J THE NALGE CO., INC.ROCHESTER 2, NEW YORK

The Quality Standardof Plastic Laboratory Ware

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New ProductsJoshua Stern

DOI: 10.1126/science.133.3464.1619 (3464), 1619-1623.133Science

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New Products - Sciencescience.sciencemag.org/content/sci/133/3464/1619.full.pdf · ard liquid sample nebulizer. To per-form an analysis, a liquid sample is atomized in the flame burner