MANUFACTURERS' LITERATURE
VARIAN Potentiometer RECORDERS Offer
exceptional
versatility
because...
Tubular Products. Illustrated 20-page catalog shows sizes, specifications, finishes, tolerances, chemistry, and applications of small diameter tubing up to one inch o.d. One section is devoted to inspection procedures and quality control. J. Bishop & Co. Platinum Works (Bull. 18). 618
Temperature Equipment. Illustrated 44-page catalog describes the Thermolyne and Temco line of electric furnaces, hot plates, temperature controllers, pyrometers, magnetic stirring hot plates, and clinical apparatus. Thermolyne Corp. (Cat. 61). 621
ALARM/CONTROL Alarm and control switches,and retransmitting slide wires, add a valuable dimension of simple control to the already-versatile two-channel G-22. With these optional accessories they can work unattended to control two variables within the l%accuracy of the recorder, while making a permanent record of what has happened. \% accuracy, spans from 10 mv to 500 v, 1 second full-scale balance time, two chart speeds standard, four optional (H'/hr. to 16"/min.), full scale zero adjust, event markers and other options. Portable and rackmounted models available from $1,075. Write Instrument Division:
VARIAN associates PALO ALTO 4, CALIFORNIA
Circle No. 191 on Readers' Service Card
for Your Development Work
Alcohol Chart. Revised wall chart shows all approved uses of specially denatured alcohol formulas, based on alcohol regulations now in effect. Commercial Solvents Corp. 619 Chromatography Supplies. Illustrated 12-page bulletin shows chemicals and accessories for gas chromatography. Included are such items as supports, syringes, chart paper, hardware, and capillary columns. MicroTek Instruments, Inc. (Bull G-201-B). 620
THERE ARE ACCESSORIES FOR
ISOTOPES
Air Pumps. Illustrated price list covers the company's complete line of rotary vacuum pumps, pressure pumps, gas boosters, and accessories. Leiman Bros., Inc. (Price List 61261). 6 2 2 IR Transmitting Materials. Fourpage folder covers 15 materials, giving transmission curves and detailed properties on each. Servo Corp. of America. 623 Electric Ovens. Illustrated 4-page bulletin describes and gives specifications on several types of batch ovens, as well as on the company's five-drawer ovens. Blue M Electric Co. (Bull. 1961). 624 C0 2 Determination. Eight-page methods report describes a procedure for automatic, continuous determination of carbon dioxide in biological fluids. A flow diagram of the system used is included. Technicon Instrument Corp. 625 High Vacuum Pumps. Illustrated 6page brochure describes the company's series of two-stage Hyvac vacuum pumps, which range in capacity from 21 to 410 liters per minute. Also shown are several high vacuum system components. Central Scientific Co. (Booklets). 626 Spectrum
Analyzer
Techniques.
Technetium-99: A useful research tool for corrosion inhibitor studies and prepa r a t i o n of special alloys. Oak Ridge National Laboratory also offers more than 300 radioactive and stable isotope products.
RADIOISOTOPES Processed Solutions — 90 processed radioisotopes may be obtained, including many carrier-free and high specific activity products. Now Available —Seandium-46 at $150 a curie; sulfite-free 1-131 at $2 per m c ; technetium (as element or ammonium pertechnetate) $100 a gram; calicum-47, with less than 5% Ca-45, S200 per m c ; 1-125 in research quantities.
STABLE ISOTOPES More than 200 stable isotopes available from 50 elements Chemical processing and target fabrication services also offered. . . . Ultra-high isotopic purity in a number of isotopes. For a catalog or information concerning your special isotope requirements, write to: I s o t o p e s D i v i s i o n , Oak R i d g e N a t i o n a l Laboratory, P . O. Box X , Oak Ridge, Tennessee.
ISOTOPES
OAK RIDGE N A T I O N A L LABORATORY Operated by UNION CARBIDE CORPORATION for the U.S. ATOMIC ENERGY COMMISSION
Third printing of this handbook discusses measurement techniques with the spectrum analyzer, along with a history and general theory of operation. Part of the booklet describes the comCircle No. 118 on Readers' Service Card
138 A • ANALYTICAL CHEMISTRY
