NEW Electronic Controlled LAB MIXER
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CENCO®
COULOMETRIC TITRATOR
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FOR RAPID
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$90
The
HELLER
AUTOMATIC
TITRATIONS GT-21
provides DC speed control from AC outlets. Thyratron tubes on controller supply demanded current by converting power in stepless variation to the direct current motor. Assures constant torque as mixes become viscous. Variable, reversible motor has direct and gear drive. Armature shaft speed, 0-5000 rpm. Gear shaft, 18:1 ratio. Chuck, shafts, 3step pully furnished.
Measures both mercaptans and olefins accurately . . . automatically Simple to operate. Titrates wide range of concentrations. Registers reaction time directly in tenths of a second
Complete with attachments F.O.B. Las Vegas Order from your Laboratory Supply Dealer
W r i t e for Bulletin 1 2 6 4 A. Licensed under patent rights Standard Oil Co. (Ind.)
cenco
GERALD K. HELLER CO.
®
1819 Industrial R d . , Las Vegas, Nev.
Circle No. 74 A-1 on Readers' Service Card, page 101 A
CENTRAL S C I E N T I F I C C O . 1 7 0 8 Irving Park Road · Chicago 1 3 , Illinois Branches and Warehouses — Mountainside, N. i. Boston · Birmingham · Santa Clara · Los Angeles · Tulsa Houston · Toronto · Montreal · Vancouver · Ottawa
Circle No. 74 A-2 on Readers' Service Card, page 101 A
ALUMINA MORTAR AND PESTLE No. 524
MORTARS COORS AND U.S.A. PESTLES
NON-SKID RUBBER RING INSET
Coors Mortars and Pestles are No. S20
available in six styles and fortynine sizes.
No. 522
Porcelain, Mullite and Aluminum Oxide mortars and pestles provide the right material for economical and efficient grinding.
All Coors Mortars and Pestles are completely vitrified and nonabsorbent. Sizes up to 9 liters in capacity. AVAILABLE FROM YOUR LABORATORY SUPPLY DEALER
COORS PORCELAIN C O M P A N Y GOLDEN, COLORADO
No. 525
For further information, circle number 74 A-3 on Readers' Service Card, page 101 A 74 A •
