MANUFACTURERS' LITERATURE
ARE YOU USING THE READERS' INFORMATION SERVICE? In This Issue Your RIS Coupon Appears on Page 41A
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
Every chemist, every chemical engineer should make certain he keeps up to date by:
MANUFACTURERS' LITERATURE
(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
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LITERATURE, continued
Time-Saving Versatile Aids for the Lab!
plane reflectance gratings and 20 types and sizes of plane transmission gratings available from Bausch & Lomb Optical Co. {Booklet D-261). 35 Serological Baths. Four-page bulletin describes design of serological water baths with temperature control of ± 0 . 4 ° C. and accessories. Fisher Scientific Co. {Bull. FS-844). 36
ELECTROPHORESIS APPARATUS Aminco's leadership in this field has made its models of electrophoresis apparatus standard equipment in research institutions throughout the United States and abroad. Compact and complete units, these instruments incorporate optical systems of high resolving power, regulated high-voltage supplies, mechanical refrigerat i o n , and dialysis facilities. Convenient to use, high o u t p u t , mobile, and versatile for exacting research in electrophoresis analysis, preparative work, and diffusion studies. BULLETINS B-2175 &. B-2281.
ELECTROPHORESIS APPARATUS
WARBURG APPARATUS Maximum operating convenience and superlative performance are characteristic of Aminco Warburg apparatus that is serving so creditably the world over. Available in the rotary type (illustrated) or dualshaker (rectangular) type, in heated or refrigerated models. The many advantages of Aminco apparatus are described in BULLETIN 8-2185.
WARBURG APPARATUS
DUBNOFF SHAKER-INCUBATOR
Hardness Testing. Two methods for testing hardness and drying time of coating materials by use of Sward hardness rocker and automatic or visual counting described in 4-page bulletin. Gardner Laboratory, Inc. {Bull. 154).
LIGHT-SCATTERING MICROPHOTOMETER
41
Measures from 20 micro-microlumens to 20 lumens, absolute turbidity, dissymmetry, depolarization, fluorescence, reflectance, phosphorescence, optical density, and optical transmission. Has outlet for connection to a recorder. BULLETIN B-2241.
FHOTOMULTIPLIER MICROPHOTOMETER
LIGH1-SCATTERING MICROPHOTOMETER
Other Aminco Laboratory Instruments Freeze-dry Apparatus Optical Absorption Cells Centrifuges Flame Photometers Pipetting Machines Thermoregulators Constant Temperature Baths Relays I ncubators Pumps Ovens &. Sterilizers Stirrers Mechanical Dialyzers Immersion Heaters Coleman Spectrophotometers, Fluorometers, Nephelometers, Colorimeters, and pH Meters
PHOTOMUI TIPLIER MIC ROPHOTOM ETER
AMINCO Laboratory Instruments AMERICAN INSTRUMENT COMPANY, I N C . Silver Spring, Maryland
·
In Metropolitan Washington, D. C.
For further information, circle numbers 50 A-1, 50 A-2, 50 A-3, 50 A-4, 50 A-5 on Readers' Service Card, page 41 A
50 A
Research Microscopes. Bulletin of 8 pages covering design and accessories for research microscopes available from American Optical Co. {No. 5). 38 Flow Rate Test Kit. Folder of 4 pages on flow rate test kits with interchangeable borosilicate glass metering tubes for use with liquids and gases. Ace Glass, Inc. {Lo-Flo Rota-Kit). 39 Null Indicator. Two-page data sheet on null-balance detector housed in portable case, requiring no special mounting or leveling, and unaffected by vibration. Minneapolis-Honeywell Regulator Co. {Data Sheet 10.0-12). 40
Up to 30 specimens can be shaken simultaneously in this improved apparatus at temperatures from 25° t o 100° C , with a sensitivity of plus-minus 0.015° C. within the flasks. Intended for metabolic studies not requiring the measurement of gas exchange. Accommodates two types of racks for holding beakers or Erlenmeyer flasks. Shaking speed is constant regardless of line-voltage fluctuations. Has provisions for gassing. Flasks may be simultaneously cooled, gas equilibrated, incubated, or boiled. Many other features described in BULLETIN B-2239.
For precise measurement and comparison of light i n tensities at selected wavelengths. Measures from 20 micro-microlumens to 20 lumens, densities from 0 to 11, and phototube currents from 10-* to 10 n amperes. Range can be extended with neutral filters. BULLETIN B-2190.
Water Heater. A 2-page specification sheet on an electric water heater that maintains a 2.5-liter supply of hot water at line pressure under automatic temperature control for use with water baths and other laboratory devices. Parr Instrument Co. {Spec. 1500). 37
Phase Microscopes. Four-page folder describes laboratory microscopes equipped for both phase and brightfield microscopy. American Optical Co. {No. 8). 42 Test Cabinets. Four-page brochure describes and illustrates test cabinets for high and low temperatures and controlled humidity manufactured by Standard Cabinet Co. 43 Laboratory Planning. Bulletin of 8 pages with suggestions on the planning of laboratories. Laboratory Furniture Co., Inc. 44 Film Applicators. Two-page sheet describes duplex and triplex wet film applicators for surface coating samples and their use in color matching and gloss and opacity comparisons. Gardner Laboratory, Inc. {Bull. 151). 45 Filter Papers. Four-page leaflet describes glass fiber filter papers for Gooch crucibles. H. Reeve Angel & Co., Inc. 46 For further information, see coupon on page 41 A ANALYTICAL
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