NEW PRODUCTS Recording is linear in transmittanee, linear in absorbance, or direct in energy. The built-in recorder presents data on file-size preprinted chart paper. Stand ard printed charts are available for the most common ranges on translucent paper for easy Ozalid reproduction. 5
designed apparatus has a three-heat hot plate which permits rapid heating until distillation begins and reduction of heat thereafter to maintain the desired dis tillation rate. Vapor locking is prevented by passing the raw solvent feed line through the water-cooled condenser; vapors passing up the feed line are condensed and refluxed back into the retort. This ar rangement also serves to preheat the solvent. The still has found application for the recovery and purification of such sol-
Solvent Recovery Still Precision Scientific Co. has redesigned its solvent recovery still used in labora tories where large amounts of solvents are employed for extraction. The re-
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A new photoelectric recording Raman spectrometer has been brought out by The Perkin-Elmer Corp. for molecular structure studies and quantitative analysis of complex mixtures. The Model R features a Torontotype helical mercury arc excitation source and a coated optical system for transferring Raman radiation from the sample tube to the monochrometer. Dispersion system, wave-length drive, detector, and recorder are similar to components used on standard PerkinElmer infrared spectrometers.
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LABORATORY USE THE WORLD OVER 7
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The instrument operates through a frequency range of 100 to 3500 c m . - 1 Survey spectra can be scanned in 12 minutes, high resolution spectra in 50 minutes. Resolution is 5 c m . - 1 for survey work and 2 to 3 c m . - 1 on high resolution spectra. Sample tubes of 20- and 4.5-cc. size are provided. 7
8 Amino Acid Standards
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For use as primary standards in microbiology, chromatography, and testing, Mann Research Laboratories, Inc., is offering a number of amino acids purified by phase solubility and checked by paper chromatography. · The amino acids are available in two kits. One kit contains 17 natural L-amino acids, the other contains 15 racemic DL-amino acids. 8 Hot Plate-Magnetic Stirrer
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U. S. STONEWARE CO. A k r o n 9, Division
Plastics & Synthetics
For further Information, circle number 42 A on Readers' Service Card, page 37 A
42 A
Raman Spectrometer
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vents as carbon tetrachloride, petroleum ether, benzene, gasoline, alcohol, and other extraction vehicles. 6
Ohio
Stirring and heating in one operation are possible with a combination mag netic stirrer and hot plate being mar keted by Will Corp. Stirrer and heater will also function separately if desired. The magnetic stirrer utilizes a pulley and belt drive to rotate the permanent For further information, see coupon on page 37 A ANALYTICAL
CHEMISTRY
