Manufacturers' Literature Microdensitometer/Spectrophotom eters. Two combination microdensitometers/ spectrophotometers, Models G and K, are introduced in a 4-page bulletin. The instruments are described and pictured and some interesting ap plications are given. Canalco, Inc., 5635 Fisher Lane, Rockville, Md. 20852 632 Sonic Dismembrator. Four pages il lustrate and describe Model 300 sonic dismembrator, which is the most pow erful ultrasonic source available. Ac cessories with prices are also described. Artek Systems Corp., 275 Adam Blvd., Farmingdale, Ν. Υ. 11735 633 Digital pH Meter. Two pages picture and describe a digital pH meter, Model 801. A digital printer system for printed records of readings as displayed is also shown. Artek Systems Corp., 275 Adam Blvd., Farmingdale, Ν. Υ. 11735 634 Hot Plates, Stirrers-Mixers, Bench Protectors. An 8-page bulletin, SE100 10-69, describes and pictures the company's line of laboratory hot plates, hot-plate stirrers, stirrers, mixers, and the Pyroceram glass-ceramic bench protector. Corning Glass Works, Corn ing, Ν. Υ. 14830 635
photofluorometers with accessories. A bibliography and other information on fluorescence are also covered. Ameri can Instrument Co., Inc., 8030 Georgia Ave., Silver Spring, Md. 20910
Scientific Instrument News. Chroma tograph Series. Vol. 3, No. 1, 18 pages, carries the three articles: "Gas Chromatography of Neutral Fats, Ali phatic Carboxylic Acids and Their Esters," "A Round Table Discussion on Analyses of Pesticide Residues," and
"Electron Capture Detector with Nickel-63 Radiation Source." 1 Nishinokyo-Kuwabaracho, Nakagyo-ku, Kyoto 604, Japan Innovation. Vol. 1, No. 2, 22 pages, in cludes an article on measuring environ mental improvement which discusses the uses of the company's photometric analyzer, liquid chromatograph, and luminescence biometer. E. I. du Pont de Nemours & Co., Wilmington, Del. 19898
Your kind of TLC plate Analtech has taken the "classic" procedure for hand made thin layer chromatography plates and automated it. All standard adsorbents and many special ones can be pre-coated with virtually perfect uniformity . . . in large or small quantities. A wide range of plate sizes, coating thicknesses and custom adsorbents are available. ANALTECH INC. Write for our catalog today. 100 S. Justison St., Wilmington, Del. 19801.
Company Periodicals Requests for copies of the following publications should be sent directly to the address shown. Business or pro fessional letterheads are requested. GS Labocopeia. Number 1, 8 pages, describes a number of research and laboratory chemicals and laboratory equipment applicable to analytical chemistry including pH indicator strips, laboratory detergent, lab grease, and density determinators for solids and liquids. Gallard-Schlesinger Chemical Mfg. Corp., 584 Mineola Ave., Carle Place, Ν. Υ. 11514 Current Peaks. Vol. 3, No. 1, 4 pages, features an article on total organic con tent analysis with a new flame ioniza tion detector thermal analyzer by W. J. Butz, A. C. Stapp, and Alan Di Stefano. The article was presented at the 1970 Pittsburgh Conference on Analytical Chemistry and Applied Spectroscopy. Carle Instruments, Inc., 1141 East Ash Ave., Fullerton, Calif. 92631 Fluorescence News. Vol. 5, No. 1, 12 pages, includes articles on temperature and matrix effects on the phosphores cence of aromatic hydrocarbons and on increasing the usefulness of spectro-
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ANALYTICAL CHEMISTRY, VOL. 42, NO. 7, JUNE 1970
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