V O L U M E 2 5, NO. 8, A U G U S T
COORS
1953 *
35 A
*7«fivied ψι&Ηκίί joint
U.S.A.
NYLAB
TUBES
Special'Pcvifioue
TUBES
COORS Sillimonite Tubes can now be furnished with ends ground to m a t c h s t a n d a r d t a p e r Ï gloss .O'nts these joints are ground to U. S. Bureau of Standards Commercial Standard CS21-39 for ï ground JONlfl This a l l o w s i n c o r p o r a t i o n of refractory sections in apparatus. Very useful in furnace s e t u p s involving vacuum-tight systems.
%
&
à
precision voltage stabilizer
Obtainable
from
your
laboratory supply dealer WRITE FOR BULLETIN
COORS PORCELAIN COMPANY GOLDEN, COLORADO
No. 4
of the
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BLECTROHICAUy REGULATED 6-VOLTS DC · REGULAWH ± 0.01% Designed especially for spectrophotometers ing the Beckman Model DU) and for general tory purposes. • COMPLETELY REPLACES the corrosive ing storage battery.
(includlabora-
non-sustain-
• ELIMINATES periods of drifting, unnecessary delays, and general nuisance. • ALWAYS READY for instant use with ordinary AC power lines.
DC OUTPUT FROM THE TWO MAIN (outside) Terminals: 5.5-6.5 volts, adjustable. 0-5 amperes; or, after disconnecting the voltage divider, 0-6 amperes. FROM A N INTERMEDIATE TERMINAL (volfage divider): 2.0 volts, when the main terminals are at 6.0 volts. This is a factory setting intended for use with the DU Spectrophotometer (current drain uncter 0.1 ampere). The voltage divider can be reset b y the user to deliver any output within the range, 0-6 volts, at currents under 1.0 ampere. Dimensions: 1 7 " x l 3 " x l 0 " Weight: Approx. 50 lbs. NO. 80710 Voltage Stabilizer . . . . Price—$375.00 Write for Bulletin
453.
' Patent Pending
Paper bound . . . $2.00 per copy obtainable from
American Chemical Society 1155 Sixteenth St., N.W., Washington 6, D.C.
NEW YORK im^B KEY TO ALL LABORATORY SUPPLIES
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