LITERATURE, continued
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
Time-Saving
Versatile Aids for the Lab! 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
Research Microscopes.
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
SHAKER-INCUBATOR
LIGHT-SCATTERING MICROPHOTOMETER
FHOTOMULTIPLIER MICROPHOTOMETER
Other
Aminco
Laboratory
LIGHT-bCATTERING MICROPHOTOMETER
Instruments
Freeze-dry Apparatus Optical Absorption Cells Centrifuges Flame Photometers Pipetting Machines Thermoregulators Constant Temperature Baths Relays Incubators Pumps Ovens &. Sterilizers Stirrers Mechanical Dialyzers Immersion Heaters Coleman Spectrophotometers, Fluorometers, Nephelometers, Colorimeters, and pH Meters
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). 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.
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.
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
DUBNOFF SHAKER-INCUBATOR 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.
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
PHOTOMUI TIPLIER MICROPHOTOMETER
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
AMINCO Laboratory Instruments AMERICAN INSTRUMENT COMPANY, INC. Spring, Maryland • 50 InA-4, Metropolitan Washington, D. 41C.A For further information,Silver circle numbers 50 A-1, 50 A-2, 50 A-3, 50 A-5 on Readers' Service Card, page 50 A
For further information, see coupon on page 41 A ANALYTICAL
CHEMISTRY
