14 A A N A L Y T I C A L C H E M I S T R Y

It's all electrical! f F POTENTIOMETRIC Viscosimeter

Provides Continuous Reading Without Mechanical Clutches and Linkages

H e r e for t h e f i rs t t i m e eve r is t h e α / ί -e lec t r ica l Potent iometr ic Viscosimeter, designed for economical measurement of viscosity, especially for thixotropic, gel or polymerizing substances.

Extremely rugged in construction, this new instru­ment eliminates the use of complicated mechanical clutches and linkages. I t is easily adaptable for labo­ratory research or continuous plant operation, and can also be used in conjunction with any Potentio­metric recording devices. Readings are continuous and thus the instrument is ideal for measurements in systems which are rapidly changing.

When used for gel-time studies, the new Viscosi­meter provides automatic stop at maximum deflection. There is an addit ional outlet for intermit tent t imer when used in studies of thixotropic or congealing substances. It also has adjustable ranges to obtain comparable accuracy.

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The model illustrated is primarily for gel-time studies and therefore employs a 25 R.P.M. motor to minimize channelling and cutting in heavy liquids. The instru­ment can be supplied with synchronous motors of a wide variety of speeds up to 300 R.P.M. True cylin­drical rotors of various sizes and special shaped rotors are available for precise fundamental viscosity deter­mination. The torque spring is easily replaceable to change sensitivity.

Any suitable model can be custom-built for your problem.

How it works Based on the well-known principle of measuring

torque exerted on rotating member immersed in vis­cous fluid. This torque is measured by an all-electrical system based on the potentiometric resistor method. Absolute viscosity is obtained by calibrating against liquids of known viscosity. The torque measurement may be made on an indicating or recording potentio­meter. Gel-time studies are made by determining time for viscosimeter to give maximum reading.

Prite list G 2S510 JACOBS VISCOSIMETER, Gel Time Model

A continuous reading instrument for measuring the viscosity of heavy fluids and semi-solids and for determining polymerization rates and gel times. The instrument can be used as an indicator in conjunction with G25510A(below), or can be hooked directly to any recording potentiometer.

Price: $375.00 G 25510A Indicating Accessory

Indicating accessory for use with G 25510 (above), comprising a standard dry cell, resistors and a milliammeter mounted in a finished cast alumi­num case. Price. $85.00

G25510B Stand Extra heavy stand for mounting G 25510 Jacobs Viscosimeter. Price: $25.00

G25510C Rotor For gel point determination. This rotor does not. have a linear torque response to change in viscosity but is designed to give some mixing in polymerization studies. Its conical design decreases the possibility of cutting a hole in especially heavy mixtures. Price: $3.00

The EMIL GREINER Co. NEW YORK 13, N.Y.

4 Corey St., West Roxbury, Mass.: P.O. Box 223, Albany 2, Ν. Υ. 2127 Fourth St., Berkeley, Calif.

2 0 - 2 6 N. MOORE STREET