working with PHOTO DETECTORS? TRY THE NEW BROWER MODEL 1 3 1 — I T ' S THE M O S T PRECISE AND VERSATILE DETECTION SYSTEM AVAILABLE. The Brower system features the most ad vanced solid-state electronics combined with the classical chopped-light technique •used in the highest quality spectrophotom eters. This approach eliminates groundloop system i n t e r c o n n e c t i o n problems while greatly reducing noise, thermal drift, and stray light errors encountered with the more common D.C. systems.
FACT FINDH! Straight as an arrow, you go right to the fact you need — quickly, surely, in seconds — through the 4-way index of CHEMICAL MATERIALS CATALOG. All the facts you need on chemicals and raw mate rials are there for you to pick and choose from. No "ifs," "ands" or "buts" — CMC lines them up for you! So reach for CMC — no need to look else where. It finds the facts you need — and finds them FAST.
cmc CHEMICiL
IMPORTANT FEATURES OF THE 131:
MlIERIltS
C1IAÎ0G
REINHOLD PUBLISHING CORPORATION A subsidiary of , CHAPMANI REINHOLD, INC.1
430 PARK AVENUE · NEW YORK, Ν. Υ. 10022 Circle No. 15 on Readers' Service Card
Π No zero drift. Π Extremely sensitive — 0.3 nanovolt full scale. •
Operates directly with all types of de tectors.
•
Single plug-in system.
card programs
entire
NOW THERE ARE TWO HELLER LAB STIRRERS
Π Mechanical or electronic light beam modulation available at any optical chopping frequency. WANT TO UPGRADE YOUR PRESENT OPTICAL MEASUREMENT CAPA BILITY? We have an experienced technical staff and a full line of accessories to help you with detectors, double-beam optics and ratio measurement techniques. Let us know your requirements and we'll respond with a proposal, data sheets and appropriate application notes.
The Famous GT21 1/40-HP (shown here) at $99 The All-New 6T60 1/20-HP at $156 Nearly 25,000 Heller GT21 adjustable speed lab stirrers have been sold. The new Heller 6T60 stirrer offers the GT21's abilities in a powerful 1/20-HP version. Heller solid-state, printed-circuit con trollers provide adjustable speed with automatic correction for chancing viscosity and line voltage variation; operate on 115-volt 50-60 cycle A.C. Speeds: GT21—0-6000 RPM using armature shaft, 0-333 RPM using gear shaft; 6T60 — 0-4000 RPM with arm ature shaft, 0-400 RPM with gear shaft. Prices of both include bracket for mounting on lab stand, 3-jaw chuck and paddle, and, with the GT21, 3-step pulley and propeller. Write for Bulletin 639. Available through leading lab supply dealers
BROWER LABORATORIES, INC. Turnpike Road., Westboro, Mass. 01581
Circle No. 212 on Readers' Service Card 150 A
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ANALYTICAL CHEMISTRY
G. K. HELLER CORP.
GKH
Box 4 4 2 6 · Las Vegas, Nev. 89106 249-06 Jericho Turnpike · Bellerose, N.Y. 11426
Circle No. 165 on Readers' Service Card
