Here's the versatile, regulated DC source you've been looking for —
N O B A T R O N OKQi -^^^turning this knob gives you ·
100-300DC at 1-10 amps (model SR2) 5-135VDC at 1-10 amps (model SRI 00) 5-30VDC at 3-30 amps (model SR30) with ± 0 . 2 5 % regulation accuracy!
The Sorensen Nobatron-Ranger is essentially an adaptation of the proved Nobatron circuit**, with the added feature of continuously adjustable output voltage over a wide range. This makes the RANGER an exceptionally good investment for the many laboratories and test installations where a multi-purpose DC source Can be used to advantage. ELECTRICAL CHARACTERISTICS Input
voltage
Output voltage load range
Regulation
Ripple
range
and
accuracy
°5-130VAC, 10, 50-60~for models SR30 and SR100 190-260VAC, 10, S0-60~for model SR2 5-30VDC at 3-30 amps in model SR30 5-135VDC at M O amps in model SR100 100-300VDC at 1-10 amps in model SR2 ± 0 . 2 5 % at any output voltage setting with an input between 105 and 125VAC. The accuracy will be slightly less at the extreme value of the input.
All RANGERS are 22" wide by 17V4" deep by 47V4" high. They are self contained in handsome cabinets, equipped with casters for easy mobility. Meters are furnished as standard equipment, and there is adequate protec tion against overload, overvoltage, and tube filament failure. Write for further information, and for your free copy of the new Sorensen general catalog, to Sorensen & Co., Inc., 375 Fairfield Ave., Stamford, Conn. In Europe, please correspond directly with Sorensen A.G., Gartenstrasse 26, Zurich 2, Switzerland.
375 FAIRFIELD AVENUE, STAMFORD, CONNECTICUT
Professional Status of Analytical Chemist Recognized in Tax Case Official recognition by the State of New York of the professional status of a practicing analytical chemist has re sulted from a decision in a 9-year-old tax case involving Abraham Mirkin, owner and operator of the Mirkin Analytical and Pathological Laboratory. Dr. Mirkin, a Russian-born chemist, who holds a Ph.D. degree in chemistry from the University of Bern, came to the United States in 1912. He worked as an organic and analytical chemist for several chemical companies and estab lished plants for the manufacture of organic and clinical chemicals. In 1922 he established the laboratory which he still operates. He has been an ACS member since 1919. New York state laws exempt pro fessional men engaged in the practice of their profession from the tax on un incorporated business. Dr. Mirkin's claim to this exemption was rejected by tax officials. After paying the tax in 1946, Dr. Mirkin appealed to the ACS for aid. On the basis that the issue was important to the chemical profession, the Board of Directors of the ACS, upon advice of ACS counsel, Elisha Hanson, secured counsel to assist Dr. Mirkin. At an informal hearing, Dr. Mirkin's claim to professional status was again denied. A formal hearing was held September 21, 19.54. Witnesses who testified as experts on chemistry as a profession were Raymond E. Kirk, head of the chemistry department a t Brooklyn Polytechnic Institute and member of the ACS Board of Directors, and Warren M. Sperry, chairman of the New York Section of ACS and former chairman of the ACS Committee on Clinical Chemistry. They supported Dr. Mirkin's claim that conduct of an ANALYST'S CALENDAR
1 % RMS max. of output setting
SORENSEN
NEWS
•Reg. U.S. Pat. Off. " M o d e l SR2 uses a circuit device patented by Wm. J. Brown.
Pittsburgh Conference on Analytical Chemistry and Applied Spectroscopy. P i t t s b u r g h , P a . , F e b r u a r y 28 t o March 4. American Chemical Society. 127th N a tional Meeting, Cincinnati, Ohio, M a r c h 20 t o April 7. American Association of Spectrographers. 6th A n n u a l Conference, Chicago, 111., M a y 0. Third Annual Conference on Mass Spec trometry. A S T M C o m m i t t e e R-14. M a r k H o p k i n s Hotel, S a n Francisco, M a y 23 t o 27. Eighth Annual Analytical Symposium. Syracuse University, Syracuse, Ν . Υ . J u n e 17 a n d 18.
For further information, circle number 28 A on Readers' Service Card, page 49 A
28 A
ANALYTICAL
CHEMISTRY
