PARR ADIABATIC CALORIMETER
New
with
automatic
temperature control
For rapid and accurate B.t.u. and calorific value determinations with coal, oil, jet fuels, foods and other solid or liquid samples.
new electronic potentiostats
A new solid-state automatic controller eliminates manual temperature adjustments, improves the repeatability and speeds all calorific tests.
Ask for our latest calorimeter catalog
PARR INSTRUMENT COMPANY 211 Fifty-Third St.
Moline, Illinois 6 1 2 6 5
Circle No. 54 on Readers' Service Card
What's a good VACUUM connection? A hew line of Wenking Electronic Potentiostats for various electrochemical investigations is now available. Three basic series are offered: a new laboratory model for routine requirements; a new standard series including several "high current" models (to ± 10A); and a new "fast rise" series for shortest rise times and/or high output voltages.
Considering that it was designed to satisfy a number of special applications, Hoke's Gyrolok fitting is surprisingly at home in vacuum service. It will, for instance pass a mass spectrometer leak test handily. So, if you worry about high vacuum systems, the new Gyrolok catalog with all its sizes, shapes & materials is a pretty good tranquilizer. Your Hoke distributor has one for you.
Accessory systems, including a high precision voltmeter and motor potentiometers, are also available. For complete up-to-date information on the most widely used Electronic Potentiostats, request our Data File on the new Wenking models.
B GYROLOK
BRINKMANN I N S T R U M E N T S CANTIAGUE ROAD, WESTBURY, N.Y. 11590/EO 4-7500
FLARELESS TUBE FITTINGS H O K E M F G . C O · 1 TENAKILL PARK · CRESSKILL, N.J. See ACS Laboratory Guide for All Products/Sales Office Circle No. 85 on Readers' Service Card
Circle No. 99 on Readers' Service Card
VOL. 4 1 , NO. 12, OCTOBER 1969
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135 A
