NEW PRODUCTS use of selenium rectifiers to increase reliability and reduce over-all size and weight. I t will provide a continuous current of 8 ma. at any o u t p u t voltage setting and offers 2 % r.m.s. ripple, ac cording to the company. Auxiliary filters are available to reduce ripple to as little as 0 . 0 1 % . T h e unit is priced at $13,500 and delivery time is about four months. Sorensen & Co. P-22
Residual gas analyzer for vacuum systems has resolving power to sep arate adjacent peaks up to mass 20, and can measure quantities of gas, gas mixtures, and vapors over the mass range m / e 2 to 80. Company says high sensitivity permits analysis of residual gases in pressure range from 1 0 ~ 4 to 1 0 ~ B mm. Hg. Takes 3 amp. from 1 0 5 / 1 2 5 - v o l t , 60-cycle line. Consolidated Electrodynamics Corp. P-23
Lead air monitor measures particulate lead matter in air automatically, doing analyses at the rate of less than five minutes per sample compared with the usual three to four hours, according to the company. Lead, collected on a filter coupon inserted in monitor, is indicated directly in micrograms per cubic meter of air on a dial and recorded on a strip chart. Price: $20,000. National Spectrographic Laboratories. P-24
-250
CHROMATOGRAPHY DRYING OVEN
IN THE LABuse TIME TAPE for best results!
$360 Full V i e w , Compact Table M o d e l f o r Fast, Uniform Drying of Paper C h r o m a t o g r a m s A c c u r a t e l y Develops four 18'/4" χ 22'/2" sheets s i m u l t a n e o u s l y Model CO-4 is a thermostatically controlled in sulated oven which quickly reaches temperatures u p to 100° C. Achieves evacuation of solvent vapors with Water or motor aspirator. Heating elements con cealed in base are protected from combustible, solvent droplets. Heavy, metal-reinforced, safety glass door readily permits observation of color development with out repeated opening of door. Stainless steel oven chamber is corrosion-resistant. Overall Dimensions: 2 7 " Wide! 3 7 " high;
Proven superior by actual use. Here is the toughest, most durable pressure-sensitive tape available. WRITE O N IT! TYPE O N IT! Acid, water, dirt, grease or heat don't affect it! Withstands temperatures from -f-250° to — 7 0 ° ! A variety of colors avail able in plain or pre-printed to your specs. Numbers, identification, warning and many other time-saving uses can cut costs and in crease efficiency. ^-jg»
15'/2"deep
UNCONDITIONAL 1 YEAR WARRANTY
Write for Catalog CO-37 A NEW BRUNSWICK SCIENTIFIC CO., INC. PRECISION
LABORATORY
APPARATUS
P.O. BOX 006, NEW BRUNSWICK, NEW JERSEY Circle No. 139 on Readers' Service Card 120 A
·
ANALYTICAL CHEMISTRY
-70°
For samples and prices write to — PROFESSIONAL TAPE CO., INC. 358 Burlington Ave. Riverside, III. Circle No. 163 on Readers' Service Card
TIME LABELS
