Carl Zeiss
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NEW PRODUCTS Data Retrieval and Correlation The Termatrex data retrieval and correlation system is based on the prin- ciple of optical coincidence. Cards representing properties and/or data points are superimposed over a light source. Lights shining through the holes in these cards represent chemical compounds that have these properties and data points. Each chemical com- pound is assigned a number. A hole is drilled in a position dedicated to that number in the cards representing the properties or data points of the chem- ical compound. The system provides a ''random ac- cess memory" for correlating the prop- erties of unknown compounds with knowns. The company is currently producing for ASTM an index for x-ray diffraction data. This index contains data on 5G9S inorganic compounds and is available from ASTM. The com- pany is working with others to de- termine effective methods of retrieving and correlating other analytical data including infrared, ultraviolet, r\MK, and gas chromatographic. Jonkers Business Machines, Inc., Gaithersburg, Md. 426 The 810C well counter can be used with Baird-Atomic's complete line of scalers, ratemeters, and pulse height analyzers. The 810C will accept crys- tals up to 3" in diameter, and a va- riety of crystal assemblies is avail- able. The preamplifier is transistor- ized. Request bulletin 810C from Baird-Atomic, Inc., 33 University Rd., Cambridge 38, Mass. 427 Electronic Vacuum Gauge The Jelrus Thermivac uses a vac- uum-processed thermistor to sense the vacuum. Voltage applied to the thermistor causes the resistance to change as its temperature changes. The temperature depends on the thermal conductivity of the surround- ing gas in a vacuum system. The thermal conductivity of the gas is re- lated to its pressure down to 1 micron. Using a calibrated scale and meter, this information is converted to read pressure directly in microns. The sys- tem is accurate and rugged and is priced competitively with mercury gauges. Schaar & Co., 7300 W. Mont- rose Ave., Chicago 34, 111. 428 Molecular Weight Apparatus An isothermal molecular weight ap- paratus that requires as little as 0.5 ml. of 0.01 to 0.0S molal solution is used to determine number average mo- lecular weights up to 10,000. With weights up to 5000, accuracy is on the order of ±19i, while there is diminish- ing accuracy up to 10,000. What degree of accuracy do you need in a polarimeter? 0.005° PHOTOELECTRIC PRECISION POLARIMETER 0.005° gives you the ultimate in accuracy and speed of measurement. High precision is achieved by use of a Faraday modulator and electronic circuitry. Automatic control maintains full measure- ment accuracy even for strongly absorbent (approx. 97%) samples. Scales of divided circles and verniers are projected onto ground-glass screens at a magnification of 20x. This assures direct, parallax-free readings. The power supply provides stabilized voltages. Visit our showroom for a demonstration or write for more information. Factory trained technicians service all Carl Zeiss instruments. Circle No. 2 on Readers' Service Card 1 3 8 A · ANALYTICAL CHEMISTRY
Transcript of Carl Zeiss
NEW PRODUCTS
D a t a Retr ieva l and Cor re la t ion
The Termatrex data retrieval and correlation system is based on the principle of optical coincidence. Cards representing properties and/or data points are superimposed over a light source. Lights shining through the holes in these cards represent chemical compounds that have these properties and data points. Each chemical compound is assigned a number. A hole is drilled in a position dedicated to that number in the cards representing the properties or data points of the chemical compound.
The system provides a ''random access memory" for correlating the properties of unknown compounds with knowns. The company is currently producing for ASTM an index for x-ray diffraction data. This index contains data on 5G9S inorganic compounds and is available from ASTM. The company is working with others to determine effective methods of retrieving and correlating other analytical data including infrared, ultraviolet, r\MK, and gas chromatographic. Jonkers Business Machines, Inc., Gaithersburg, Md. 426
The 810C well counter can be used with Baird-Atomic's complete line of scalers, ratemeters, and pulse height analyzers. The 810C will accept crystals up to 3 " in diameter, and a variety of crystal assemblies is available. The preamplifier is transistorized. Request bulletin 810C from Baird-Atomic, Inc., 33 University Rd., Cambridge 38, Mass. 427
Electronic Vacuum Gauge
The Jelrus Thermivac uses a vacuum-processed thermistor to sense the vacuum. Voltage applied to the thermistor causes the resistance to change as its temperature changes. The temperature depends on the thermal conductivity of the surrounding gas in a vacuum system. The thermal conductivity of the gas is related to its pressure down to 1 micron. Using a calibrated scale and meter, this information is converted to read pressure directly in microns. The system is accurate and rugged and is priced competitively with mercury gauges. Schaar & Co., 7300 W. Montrose Ave., Chicago 34, 111. 428
Molecular W e i g h t Appara tus
An isothermal molecular weight apparatus that requires as little as 0.5 ml. of 0.01 to 0.0S molal solution is used to determine number average molecular weights up to 10,000. With weights up to 5000, accuracy is on the order of ±19i, while there is diminishing accuracy up to 10,000.
What degree of accuracy
do you need in a polarimeter?
0.005° PHOTOELECTRIC PRECISION POLARIMETER 0.005° gives you the ultimate in accuracy and speed of measurement. High precision is achieved by use of a Faraday modulator and electronic circuitry. Automatic control maintains full measurement accuracy even for strongly absorbent (approx. 97%) samples. Scales of divided circles and verniers are projected onto ground-glass screens at a magnification of 20x. This assures direct, parallax-free readings. The power supply provides stabilized voltages.
Visit our showroom for a demonstration or wr i te for more information. Factory trained technicians service all Carl Zeiss instruments.
Circle No. 2 on Readers' Service Card
1 3 8 A · ANALYTICAL CHEMISTRY
NEW PRODUCTS
The apparatus is essentially a d.o. resistance bridge, two legs of which consist of glass enclosed thermistor beads with a matched resistance of 100,000 ohms at 25° C. plus a potentiometer with readability to 0.1 ohm in the unknown leg. A closely controlled constant temperature environment is provided. Arthur H. Thomas Co., Vine St. at 3rd, P. O. Box 779, Philadelphia 5, Pa. 429
Gas Chromatographic Detectors Single or dual hydrogen flame ioniza
tion gas chromatographic detectors are available for use with the Model 21Β Electrometer. The ionization detectors use a sapphire collector insulator and can operate to 500° C. without excessive current leakage. The detector assemblies should be mounted inside a chromatograph oven and provision is made for direct connection to the electrometer. The dual detector has two burners which can be polarized either with the same or opposite polarity. Data Sheet LOE-10 describes these detectors and the electrometer. LO-ENCO, Inc., 2092 North Lincoln Ave. Altadena, Calif. 430
The Model 62 Temperature Programmer is an automatic unit which may be attached to any gas chromatograph. The controller has 11 linear rise rates from 2° C./min. to 30° C./ min. Limits are continually adjustable between ambient and 500° C. The controller may also be operated isothermally, or the linear rise rate may be stopped at any point during a run. The programmer is available either in chassis form for direct panel mounting or enclosed in a cabinet. LOENCO, Inc., 2092 North Lincoln Ave., Altadena, Calif. 431
Economical Gas Chromatograph A GC Gas Kit includes all the parts
necessary for electrical circuitry and flow system for an experimental chromatograph. It may be easily assembled and can be used with a 12-volt storage battery and any 0- to 10-mv. fast-pen strip chart potentiometer recorder. The kit includes a Gow-Mac 9285 pretzel detector with four tungsten filaments, a heated injection block, materials for construction and packing of chromatographic columns, as well as laboratory manuals. Gow-Mac Instrument Co., 100 Kings Rd., Madison, X. J. 432
Hydraulic Press Measuring 191/2 inches high with
base dimensions of 121/4 X 8 5 / 8 inches, the model L-16 press produces a total load of 36,000 pounds. Easily able to deliver the necessary 90,000 p.s.i. pressure, the press is capable of producing KBr disks for infrared analysis. The ram is stationary and the cylinder which carries the lower platen travels a total of one inch. A press with platen movement of three inches can also be supplied. Limit Research Corp., P. O. Box 852, Darien, Conn. 433
0.01° 0.05° POLARIMETER 0.01° is available in two models for tubes up to 200 and up to 400mm. in length. This uniquely designed instrument is built for convenience. All controls are within easy reach. For the First time a s iding tube changer has been built in, making a change of tubes possible from the outside without having to open the instrument housing.
POLARIMETER 0.05° is perfectly suited as a standard instrument in the medical, chemical and pharmaceutical laboratory. The dividing line of the half-shade field has uniform sharpness regardless of length of tubes or turbidity of liquids tested. No need to refocus eyepiece after zero-setting the instrument.
The Symbol of Wor ld Famous Optics
WEST GERMANY
Carl Zeiss, Inc., 444 Fifth Ave., New York 18, N.Y. IN CANADA: CARL ZEISS CANADA LTD., 60 OVERLEA BLVD., TORONTO 17, ONTARIO
VOL. 35, NO. 6, MAY 1963 · 1 39 A
CARL ZEISS
