Ivan Sorvall, Inc

able, reversible motor has direct and gear drive.Arma- ture shaft speed, 0-5000 rpm. Gear shaft i8:1 ratio.Chuck, shafts, 3-step pulley included. Orde...
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NEW PRODUCTS maximum efficiency, according to Beckman, and there is no foaming or aerosol effect at flow rates up to 600 ml. per min. The rotor is available with dis­ placement volumes of either 100 or 400 ml. P-6 Magnetic Oxygen Analyzer

Complete with attachments F.O.B. Las Vegas

$90

• Thyratron tubes on the Heller GT-21 controller sup­ ply demanded current by converting power in stepless variation to the direct cur­ rent motor. Assures con­ stant torque as mixes become either viscous or fluid. Vari­ able, reversible motor has direct and gear drive. Arma­ ture shaft speed, 0-5000 rpm. Gear shaft 18:1 ratio.Chuck, shafts, 3-step pulley included.

A null balance magnetic oxygen analyzer for analysis of oxygen in any mixture of common gases is being pro­ duced by The Distillers Company, Ltd., of England. The instrument measures magnetic susceptibility of a continu­ ously flowing sample, using a feedback system for achieving automatic opera­ tion. It is said to be insensitive to flow-rate fluctuations, tilting, shock, and vibrations. Lack of contact be­ tween the gas and hot wires or high voltages provides safety of operation.

Order from your Laboratory Supply Dealer or write—

GERALD K. HELLER CO. 1 8 1 9 Industrial Road

Las Vegas, Nevada

Circle Ho. 116 OD Readers' Service Card

CONTINUOUS CENTRIFUGATION SS-3 with Continuous Flow

8' to l'Tube Selectivity Pushbutton Automatic Controls with the Servall SS-3 Superspeed Centri­ fuge* plus selective 8-Tube collection with the unique Servall "SzentGyorgi & Blum" Continuous Flow System.* Also, the manually-con­ trolled Servall SS-4 Enclosed Superspeed Centrifuge* with remote^control. Exclusive Gyro-Action Self-Centering Drive.

I

ΪΛ-Φ

Write for Bulletin AC-3 S3

SS-4 with Remote Control

SS-34 Angle Superspeed 400 ml — 34,400 χ G

GSA Large Capacity 1,770 ml — 14,600 X G

* i P rtSÇâ su

Particle Counting 29,200 χ G — β cells

Other Rotors Under Development

Ivan Sorvall, Inc. NORWALK • C O N N E C T I C U T

Circle No. 138 on Readers' service Card

74 A

ANALYTICAL CHEMISTRY

HS Field-Aligning Horizontal* 28,800 X G •Patented: U.S.A. & Foreign SINCE 1943. THE WOBtD'S LARGEST MANUFACTURE* OF SUPERSPEED CENTRIFUGES

Any range from 0 - 1 % oxygen to 0 100% oxygen can be selected with a switch, and the limit of detection is 0.005% oxygen or 0.25% full scale de­ flection. The instrument is housed in two light alloy weatherproof cases and can be bolted to a framework indoors or outdoors. I t is designed for opera­ tion with a 5-mv. potentiometer re­ corder. P-7 Moisture Determination Balance A moisture determination balance with a claimed accuracy of ± 0 . 1 % is offered by Ohaus Scale Corp. for labo­ ratory or manufacturing control point use. The Model #6000 self-contained unit comprises a magnetically-damped analytical-type chain balance, with an infrared element in the heating cham­ ber. In use, the sample is placed on a low-cost disposable aluminum foil pan, where it is heated and dried. A single