only the QV-50 shimadzu Spectrophotometer has all these features Range—the versatile, general purpose QV-50 is measurable as far as the extreme u.v. region of 183 my, to the near infrared region of 1,200 mu. High Resolving Power—in the far U.V., visible and near I.R. regions. Minimized Stray Light—as shown by the graph, the vacuumed monochromator greatly reduces stray light. Potentiometric Measuring Circuit—provides high accuracy of measurement, (especially as needed for rotatory dispersion, circular dichroism, etc.) free from non-linearity of indicating instruments and amplifiers. Compact & Ultra Stable Power Supply— especially necessary for stability in making measurements with flow dichroism, optical rotatory dispersion, and circular dichroism. Power supply is partially transistorized for cool operation and long component life even under continuous-duty operation. Adaptable—change-over to direct reading system can be easily made. Economical—with dichroism accessories, the QV-50 provides highly accurate measurements at one-fifth the cost of instruments giving comparable performance. FREE BOOKLET fully describes the operating features, comparative advantages and complete line of accessories of the versatile QV-50. For your copy, write:
COSMOS SCIENTIFIC CO. 921 Bergen Ave., Jersey City, N.J. 07306 · (201) 925-1101 Stocking & Servicing
Dealers:
A c e Scientific Supply Co. Linden, N e w Jersey
American Instrument Co., Inc. Silver Spring, Maryland
Preiser Scientific Co. Charleston, West Virginia
Physicians & Hospital Supply Co. Minneapolis, Minnesota
Circle Να. 35 on Readers' Service Card 120 A
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ANALYTICAL CHEMISTRY
Water Determinations In 4 Minutes
1 P P M to 1 0 0 % Water L/I's Karl Fischer Aquametry Apparatus precisely determines water content of most chemicals, drugs, feeds, foods, petroleum products, coatings, dairy products, ex plosives, freeze-dried ma terials — virtually any ma terial. No false end points are possible with L / I ' s colorcoded electrode indicator. A two-lambda excess of K-F reagent in a 100 ml methanol reaction is detectable. L/I's apparatus is odorless and moisture proof. Uses orig inal K-F reagent bottle as reservoir. Includes 1 and 25 ml dual buret for high accuracy over the entire range of the instrument, with out adjustment. Price: S295 complete as shown. Components avail able separately. Send for price list and literature.
LABINDUSTRIES 1802A Second Street, Berkeley, California 94710 Phone TH3-0220 Circle No. 52 on Readers' Service Card
