Pick the Vacuum Pump that Fits Your Needs!
I 3 9 7 B — TWO-STAGE (Vented Exhaust) 0.1 MICRON 425 LITERS/MINUTE
1398—TWO-STAGE (Vented Exhaust) 0.1 MICRON 1400 LITERS/MINUTE
1400B—TWO-STAGE 0.1 MICRON 21 LITERS/MINUTE
1404H—SINGLE-STAGE (Wegner Pump) 20 MICRONS 33.4 LITERS/MINUTE
NEW PRODUCTS Fused Quartz Laboratory Apparatus A new line of high-purity clear fused quartz laboratory apparatus featuring standard taper joints and ball and socket joints is available for a broad variety of research, laboratory, process ing, process control, and other industrial applications. Standard taper joints and ball and socket joints are available. Made according to National Bureau of Standards Specifications CS-21-58, all taper joints and ball and socket joints are interchangeable. Taper joints are available in standard short-, medium-, and full-length sizes ranging from 5 / 2 0 to 71 /βο· Ball a n d socket joints range from 1 2 / 1 to 1 0 2 / 7 5 - Special shapes and sizes can also be designed and fabri cated to user specifications. Interna tional Quartz Co., 173 Kenneth St., Hackensack, N. J. 419
HIGHEST QUALITY UNIFORM PURITY CORCO REAGENT ACIDS NITRIC ACID SULFURIC ACID HYDROCHLORIC ACID
1403B—SINGLE-STAGE 5 MICRONS 100 LITERS/MINUTE
ACETIC ACID, GLACIAL
1405 H—TWO -STAGE 0 . 0 5 MICRON 3 3 . 4 LITERS/MINUTE
AMMONIUM HYDROXIDE HYDROFLUORIC ACID (ELECTRONIC GRADE) 1402B—TWO-STAGE (Vented Exhaust) O.I MICRON 140 LITERS/MINUTE
1392—TWO-STAGE (Mechanical & Diffusion) 0.001 MICRON 600 LITERS/MINUTE (at 0.1 micron)
1406H —SINGLE-STAGE 5 MICRONS 33.4 LITERS/MINUTE
1410B—SINGLE-STAGE (Weaner Pump) 20 MICRONS 21 LITERS/MINUTE P.t. No. 1,337,849
WELCH
DUO-SEAL VACUUM
PUMPS are designed to fit almost every application better and at less cost . . . in the laboratory, industry and school. Ten different models to choose from... capacities from 21 to 1400 liters per minute . . . ultimate pressures from 2x10—2 mm Hg down toi χ 10—*mmHg and better . . . two-stage and singlestage mechanical pumps with vented exhaust, and mechanical and diffusion combination pumps. Over the years, Welch Duo-Seal Pumps have built a world-wide reputa tion for best performance, greatest reliability and quietest operation. When you use a Duo-Seal Pump, you're using the best!
SINCE 1880
, ,. , For complete specifications and prices, ask for Duo-Seal Catalog
THE WELCH SCIENTIFIC COMPANY foremost manufacturers of scientific equipment
1515 Sedgwick St., Dept. 911, Chicago 10, III. Circle No. 113 on Readers' Service Card 154 A
•
ANALYTICAL CHEMISTRY
The
Series
370
Magnetic
Oxygen
CAPS & LABELS COLOR-CODED FOR EASY IDENTIFICATION
Analyzer uses the unique paramag netic property of oxygen, and its char acteristic decrease with an increase in absolute temperature, to measure the concentration of oxygen in indus trial gas streams. Applications in clude the measurement of oxygen in air liquification products and waste gases, chemical processes, catalyst regeneration, inert gas machines, glove boxes, and flue gas from boil ers, heaters, kilns, and furnaces. Analytic Systems Co., 370 South Fair Oaks Ave., Pasadena, Calif. 420 High Sensitivity Gas Chromatograpns A new 700 Series of high sensitivity gas chromatographs can be used in low level analysis such as pesticides and steroids. Basic operating features of the instruments include: linear tem perature programming; electron af finity detection; servo-driven propor tional temperature control; linear, sensitive, reproducible ionization detec tion ; and special electronics for calibra tion stability. Each instrument can ac commodate, in an interchangeable side-by-side arrangement, any two de tectors, injectors, and columns. Jarrell-Ash, 26 Farwell St., Newtonville, Mass. 421
Reagent Solvents Meeting ACS Specifications
QUALITY, PURITY... . . . the Best in Packaging and Superior Service are yours when you specify CORCO. For further information see Chemical Materials Catalog, or write to:
CORCO CHEMICAL
CORPORATION
Manufacturers of Chemical Specialties B R I S T O L , PENNSYLVANIA Circle No. 145 on Readers' Service Card
