A NEW Analytical
Tool!
The CAHN ELECTROBALANCE from W i l l Measures M a s s
DIRECTLY . . . a n d FASTER t h a n conventional Dilution M e t h o d s
The Cahn Electrobalance is an entirely new concept in micro weighing. It's as portable as a typewriter and as easy to set up and operate. I t is unaffected by vibration, variable temperature, air cur rents or even by leveling. Sample is weighed by balancing against an electromagnetic torque which is electrically controlled with high precision. Weighing chamber may be removed and operated by remote control. SWITCH SELECTS A N Y ONE OF THESE FOUR RANGES: Range mg. mg. mg, mg.
Precision 0 . 0 2 %
Sensitivity 1 2 5 8
difficult. Still lacking is a method whereby all their constituent elements can be rapidly and quantitatively de termined in such complete unknowns. I n this area, progress has been made through the recent introduction of standards claimed to yield semiquanti tative accuracy. Using a dilution tech nique whereby all samples and standards are essentially reduced to a common matrix, a method is specified with which the spectrographer can calculate concentrations accurately to ± 3 0 % of the amounts present. Improvement in Speed of Analysis
MORE PRECISELY
0- 5 0-10 0-20 0-50
REPORT FOR ANALYSTS
microgram micrograms micrograms micrograms
Accuracy 2.5 5.0 1 2.0 30.0
We hear much about the speed of spectrochemieal analysis: less t h a n 1 minute b y photoelectric and about 20 minutes b y photographic techniques. N o t m a n y years ago, management was satisfied when the same analyses were performed in a day or so. I n their relentless quest for reduced costs, management now talks about contin uous (and instantaneous) process con trol analysis. An example is an instru ment which would measure t h e nitrogen content of corn feed a n d thus provide automatic control of the protein con t e n t b y hooking u p t h e flow valves to a direct-reading spectrograph. An other is an instrument which would con trol the feed of nickel to an electric furnace and stop it just when the minimum concentration called for in the stainless steel specifications is reached. Equipment manufacturers have al ready found some of t h e answers to these demands b3^ management and, un doubtedly, have m a n y more on the drawing boards. One manufacturer, for example, claims a significant advance in analytical speed with his new combi nation photographic-photoelectric in
micrograms micrograms micrograms micrograms
Accuracy: About 0 . 0 5 % of full scale.
W i l l N o . 3 2 7 6 T Cahn Electrobalance complete with stirrups, supply of disposable aluminum pans, and set of 4 Class M calibrating weights $615.00
Will
CORPORATION and subsidiaries
ROCHESTER 3, N. Y. «ATLANTA 1, GA. · NEW YORK 12, N . Y. · BALTIMORE 24, MD„ · BUFFALO 5, Ν . Υ. SO. CHARLESTON 3, W. VIRGINIA For further information, circle number 20 A on Readers' Service Cari, page 77 A
20 A
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ANALYTICAL CHEMISTRY
Figure 8 . Read-out console used with the Baird-Atomic, Inc. direct reading attachment converts their 3-meter spec trograph to a photoelectric instrument
