Raytheon Company Commercial Apparatus & Systems Div. Department F-9 Waltham 54, Massachusetts

Yes, I am interested in Raytheon's completely packaged microwave power generator systems for gas ex­citation, please send the following material: Π Complete specification sheet Q Reprints of noteworthy articles Q Comprehensive application

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down to 0.005 gram. Both dials can be turned without arresting the bal­ance, so that quick readings are ob­tained. Accuracy of the balance is said to be 0.01 gram.

The fine weighing dial has gradua­tions of 0.02 gram from zero to one gram. The second dial for weight load­ing is graduated in one-gram increments from one to nine grams. Oscillations are oil damped for qtiick reading. The left side weighing pan is removable to aid in transferring materials from the balance. The Torsion Balance Co.

P-25

Extended scale indicator, Model Sl-60T, displays any physical parameter that can be expressed as a motion. The closed loop servo-type instrument drives a 50-in. tape scale marked from 0 to 1000 in 0.05-in. graduations. Five inches of scale are always ex­posed, with readability of 0.025% of scale. Schaevitz Engineering. P-26

Tape Programmed Process Chromatograph

New automatic process control gas chromatograph uses a motor driven

The shell of the P-K Type (IV) Lab Blender can be charged from either side by the quick removal of either of two dust- and watertight covers.

YOU GET THESE 3 DIFFERENT MIXING ACTIONS.. .

LIQUID-SOLIDS TYPE - To disperse and blend, uniformly, liquids of any viscosity with dry solids, just insert the wire cage liquid-feed bar assembly. Handles liquids from mi­nute quantities up to 40% of total weight. Liquid is introduced through hollow shaft of bar. Even critical formulations blended In 5 to 10 minutes.

INTENSIFIER TYPE - To get intensive mix­ing of hard-to-blend dry solids, or to break up agglomerates, use wire cage bar assembly. Average blending time for dry formulations! 3 to 5 minutes.

FOR GENTLE PRECISION BLENDING — Simply remove wire cage bar. Unique blend­ing action will not cause attrition or break down even the most delicate crystals. Average blending time: 3 to 5 minutes.

This new P-K Type (LV) Lab Blender owes its versatility to the design of the removable, spring-loaded liquid-feed bar assembly. Liquids and solids are prevented from entering the bearing housings by an exclusive, patented seal. Standard (LV) Lab Blenders are available in 8 and 16 quart capacities, in transparent Lucite or stainless steel. Interior of shell and stain­less steel bar assembly can be cleaned, clin­ically, in minutes. Operates on 115 ν AC.

Units can be shipped from stock. For complete technical information and prices, write to PK's Chemical and Process Equip­ment Division, 1009 Hanson Street, East Stroudsburg, Pennsylvania. IOQ

Need Gas Excitation

for free-radical production, photo­chemistry or spectroscopy?

Circle No. 109 on Readers' Service Card

1 3 8 A · ANALYTICAL CHEMISTRY

RAYTHEON Electronics Excellence in

Patterson-Kelley All P-K Twin-Shell Blenders are patented

and the name registered Circle No. 102 on Readers' Service Card

with P-K's NEW (LV) LAB πιπππη