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in a shielded compartment under the balance. The balance has the same capacity (200 grams), accuracy (±0.05 mg.), optical range (100 mg.), and semiautomatic controls as the standard Gramatic balance. Modifications include two ports in the floor beneath the pan to admit a special yoke, a hook for holding the sample, and a compensating weight to balance out the weight of the yoke when the balance is used in the conventional manner. Cover caps for the ports permit use of the balance in all usual ways. 18 Laboratory Washer Racks
ACS editors screen all manufacturers' product announcements and industrial literature, publishing only what is really new and containing valuable scientific or technical data. You can trust the judgment of ACS editors not to clutter Readers' Information Service with items of doubtful value simply to prove "readership."
The Chemical Rubber Co. has extended the usefulness of its Labwasher unit for automatic washing and drying of laboratory glassware by offering new specialized racks for the washer. A culture tube rack set accommodates both culture tubes and hypodermic syringes, holding approximately 300 pieces per load. Also available are a bottle rack for narrow-mouth sample bottles and a Petri dish rack set. 19
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(1) Subscribing and reading those ACS publications which serve his particular field. (2) Examining carefully the advertising pages in ACS publications, for they contain scientific and technical data second only in importance to the editorial pages. (3) Building up a substantial reference file of manufacturers' literature to provide valuable information quickly. The following ACS publications:
Journal of Agricultural and Food Chemistry Analytical Chemistry Chemical and Engineering News Industrial and Engineering Chemistry provide Readers' Information Service. Just circle the items you wish to receive, mail, and ACS service will bring what you want promptly.
YOUR RIS COUPON IS ON PAGE 41A
48 A
Recording Controllers. Booklet of 20 pages describes design and operation of new recording controllers with magnetic standard for continuous process control uninterrupted by periodic standardization. General Electric Co. (CED2100). 20 Voltage Regulators and Power Supplies. A 32-page catalog of electronic a.c. voltage regulators, regulated d.c. sources, frequency changers, inverters, and related equipment contains information on operating principles and technical data. Sorenson & Co. (Gat. 254). 21 Organic Acids. Booklet of 32 pages presents tables and charts on physical properties, shipping data, test methods, and uses for eight organic acids sold by Carbide and Carbon Chemicals Co. (F-4768). 22 Hydrogen Peroxide Analysis. Sixpage bulletin summarizes methods of assaying hydrogen peroxide solutions at various concentrations and under various conditions. Buffalo ElectroChemical Co., Inc. (Bull. 59). 23 Chromatography and Electrophoresis Apparatus. Catalog of 16 pages describing chromatographic cabinets, ovens, jar setups, electrophoresis units, densitometers, filter papers, replace-
ment parts, and accessory apparatus for paper strip and sheet work. Schaar & Co. (AC-54). 24 Organic Chemicals. A 96-page catalog of over 2500 fine organic chemicals, with tabulated information on their properties. Brothers Chemical Co. 25 Radiation Equipment. New industrial house organ covers applications and other news concerning x-ray, electron beam, and related devices. General Electric Co. (Radiation Digest). 26 Laboratory Apparatus. A 64-page catalog supplement lists and describes 400 new scientific instruments and laboratory apparatus available from Central Scientific Co. (1954 Lab Listing). 17 pH Control. Twelve-page brochure discusses continuous pH recording and control for industrial processes, water treatment, and waste disposal and describes typical installations for control of a variety of chemical reactions. Beckman Instruments, Inc. (Bull. 340-15). 28 Polyethylene Ware. Four-page folder gives descriptions and prices of line of beakers, bottles, screw caps, graduated cylinders, funnels, pipets, and tubing made of polvethylene. Arthur H. Thomas Co. (Bull. 114). 29 Polyethylene Ware. Catalog of 8 pages covering various types of laboratory items fabricated from flexible, inert polyethylene. Schaar & Co. 30 Oscillographs. Eight-page bulletin describes instrument with d.c. sensitivity of 700 microvolts per cm. to 500 kc. and a.c. sensitivity of 10 microvolts per cm. Volkers & Schaffer Mfg. Corp. (VS-900 Series). 31 Electrophoresis Apparatus. Bulletin of 8 pages describes applications of ionography and instruments for electrophoretic separations on wet filter paper. Precision Scientific Co. (Bull. 690). 32 Laboratory Furniture. Catalog of 16 pages covers sectional units, tables, and desks designed for educational laboratories by Metalab Equipment Corp. (Cat. EC-2). 33 Laboratory Furniture. Standardized sectional laboratory furniture and accessories described in 16-page catalog. Laboratory Furniture Co., Inc. (Cat. 2). " 34 Diffraction Gratings. Illustrated monograph of 12 pages discusses production, properties, and use of gratings and lists over 100 types and sizes of For further information, see coupon on page 41 A ANALYTICAL
CHEMISTRY
