32 A in absorbance or transmittance, permits accurate quantitative analyses. The 2-second Leeds & Northrup Speedomax G recorder will be included as standard equipment on all future Model 12-C instruments to accommodate the increased chopper speed of the new Model 81 amplifier. Brown Electronic recorders may also be obtained. 13
MANUFACTURERS' LITERATURE Spectrochemistry. Illustrated pamphlet presents brief description of spectrochemical principles. Coleman Instruments, Inc. 14 Cyanoacetamide. Bulletin contains information on the properties, specifications, and suggested applications of cyanoacetamide. The compound, an important intermediate particularly in the pharmaceutical field, is used in the synthesis of B-complex vitamins and barbiturates. Kay-Fries Chemicals, Inc. 15 Automatic Titrations. Method of conducting automatic titrations is outlined in new folder. A pH meter that operates directly on line current, without the use of batteries, is covered, as well as electrolytic apparatus and several other improved instruments. Wilkens-Anderson Co. 16 Brush and Weed Control. Data on methods and results in chemical brush and weed control, as practiced by a wide range of industrial and agricultural organizations, are presented in new company manual. Booklet describes such products as 2,4-D, 2,4,5-T, and TCA. E. I. du Pont de Nemours & Co., Inc. 17 Aluminum. A 48-page booklet contains details on company's manufacturing facilities, products, and fields served. The production of aluminum from bauxite and characteristics of aluminum are covered. The publication, containing over 250 illustrations, includes full-color reproductions on foil of nationally known consumer goods packaged in aluminum. Reynolds Metals Co. 18 Laboratory Gases. Pamphlet gives an up-to-date descriptive listing of laboratory gas prices, as well as a tabulation of the basic properties of gases and a summary of principal impurities. Ohio Chemical and Surgical Equipment Co. 19 Paint Formulations. Sixteen suggested formulations designed to meet U. S. Government paint specifications are presented in 32-page booklet. The formulations cover such products as interior gloss enamel, synthetic primer for ferrous metal and wood surfaces, alkyd resin solutions, black heatresisting glyceryl phthalate enamel, and zinc chromate primer for aircraft use. Rohm & Haas Co. 20 Cellulose Gum. Technical booklet supplies information on Hercules CMC-CT, an unpurified cellulose gum that improves the whiteness-retention properties of synthetic detergents and built tallow soaps. Booklet contains a table listing typical properties of product and typical formulas of CMC-CT with detergents and soaps. Hercules Powder Co. 21 Synthetic Crystals. A 4-page leaflet gives melting point, hardness, specific gravity, specific heat, chemical resistance, thermal expansion coefficient, refractive index, and other properties of such synthetic crystals as sapphire, spinel, titania, calcium tungstate, and cadmium tungstate. Pamphlet discusses uses, forms, and colors of synthetic crystals. Linde Air Products Co. 22 Ceramic Standards. Leaflet describes company's reflectance, color, and gloss standards and announces new porcelainenamel color standards for use with color-difference meter or
ANALYTICAL
CHEMISTRY
reflectometer. All standard panels are 4.25 X 4.25 X 0.31 inches, with the exception of the 3 X 9 inch 85° sheen standards. Henry A. Gardner Laboratory, Inc. 23 Organic Chemicals. Such organic chemicals as sodium, potassium, copper, zinc, vinyl, and aluminum acetate, acetaldehyde, paraldehyde, crotonaldehyde, and acetonitrile are discussed in 54-page booklet. Information is given on physical and chemical properties, applications, and operating procedures. Niacet Chemicals Division. 24 Lighting Fixtures. A 16-page booklet discusses fluorescent, mercury-vapor, and incandescent lighting. Booklet stresses the importance of proper lighting as a means of reducing costs, increasing efficiency by ensuring accuracy, and minimizing accidents by clearly exposing dangerous operations. Westinghouse Electric Corp. 25 Handling Volumetric Apparatus. A 22-page booklet describes the proper handling, care, and calibration of volumetric glassware. Containing 16 illustrations and 6 tables, the brochure discusses systems of weights and measure, the cleaning of apparatus, the reading of a meniscus, gravimetric and volumetric calibration, and the drainage time of burets and pipets. Kimble Glass. 26 Laboratory Apparatus. Stereoscopic microscopes, magnifier lights, fluorescent illuminators, microlights, magnifiers, and other apparatus are described in 8-page pamphlet. Arthur S. LaPine and Co. 27 DDT Formulations. A 20-page instruction booklet for the use of DDT dusts and sprays discusses several types of DDT formulations, including wettable powders, dusts, emulsions, solutions, and aerosols. Details are given on type of formulation, timing, dosage, and necessary equipment for controlling insects. Monsanto Chemical Co. 28 Foot Switch. Bulletin gives information on miniature foot switch, which may be used to control sound and transmission equipment, relays, solenoids, magnetic switches, and other devices requiring the instantaneous and accurate control of relatively low amperage loads. Foot switch comes in two models, each with a heavy rubber tread on the actuating treadle and a base of slip-proof cork and rubber. Simonds Machine Co. 29 Carbon Dioxide Recorder. Bulletin on automatic carbon dioxide recorder covers uses of instrument and gives description of Orsat principle of operation, complete with schematic drawing. Such features as temperature compensation and self-leveling are explained. Hays Corp. 30 N-Bromosuccinimide. A 42-page booklet discusses the reactions and uses of iV-bromosuccinimide. Substitution reactions, dehydrogenations, oxidations, addition reactions, rearrangements, introduction of double bonds, and proof of structure are described. Bibliography includes 282 references. Arapahoe Chemicals, Inc. 31 Dry Blender. Informative 4-page publication describes 4and 8-quart twin-shell laboratory dry blenders, which exhibit the same performance characteristics as larger production models ranging up to 250 cubic foot working capacity. Patterson-Kelley Co., Inc. 32 Voltage Regulators. Bulletin S351 gives details on the workings of automatic voltage regulators which maintain a constant output voltage regardless of fluctuations in a.c. line voltages and changes in output load. The Type IE regulator is completely electronic, contains no moving parts, and features low wave form distortion. A rating chart on the back cover of the bulletin provides engineering information for ease in selecting a unit suitable for a specific application. Superior Electric Co. 33
