New preparative gas chromatograph from Corning.
NEW PRODUCTS
Model A 3 1 0 0 , a pulse polarograph, retains the drop fall and electromechanical methods of synchronizaDelay time tion of earlier models. between the commencement of drop growth and pulse application is now variable in 0.2 sec steps from 0.5 to 6 sec. Voltage sweep extends 2.5 V anywhere between + 2 . 5 t o —2.5 V with reverse sweep facilities. The time required for a polarogram depends on drop life and is variable from four per minute to four per hour in six steps. Southern Analytical Ltd., Frimley Rd., Camberly, Sur408 rey, England. "^ New CORNING® APG-402 preparative gas chromatograph
M e r c u r y - M e r c u r y Oxide Electrode Here's w h y the new CORNING® APG-402 gas chromatograph is the most sophisticated—most reliable —preparative gas chromatograph available today: • injection system without moving parts keeps samples under blanket of carrier, stops dribbles. Reproducibility is 1 % measured by peak height, 46 consecutive runs, 2.5 ml level. • noncontaminating collection manifold prevents cross-contamination with unique reverse flow of carrier in all lines. No moving parts. • solid-state electronic collection programmer allows you to cut peaks at different levels front and back, yet treat each peak individually; waste 0-9 peaks between fractions, or accumulate 1 -8 peaks as a fraction. The APG-402 combines this sophisticated reliability with control simplicity that makes its operation easy to learn, makes it easy to handle. Send for Bulletin No. SI-40. Corning Glass W o r k s , Scientific Instruments Dept. A C , Medfield, Mass. 02052.
CORNING SCIENTIFIC
INSTRUMENTS Circle No. 33 on Readers' Service Card
88 A
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ANALYTICAL CHEMISTRY
This electrode is indispensable for research on alkaline batteries such as the nickel-cadmium, silver-zinc, and zinc-air systems. The potential of the electrode is stable to ± 1 mV. The nonglass membrane is completely inert to strong alkaline solutions, shock-resistant, and virtually immune to attack by acids and bases. Electrochemical Research Associates, 70 Hudson St., Hoboken, N. J. 07030 409
Desiccator Cabinet This one-piece vacuum desiccator cabinet is molded of polyester reinforced with glass fibers. The hard, smooth, nonporous surface is proved noncombustible and chemical resistant. The cabinet will safely hold a vacuum up to 25 lb mercury and more. Labconco Corp., 8811 Prospect, Kansas City, Mo. 64132 410
