BACK BONE

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BACK BONE OF ELECTRON MICROSCOPE PRECISION

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RCA

PREMIUM QUALITY

TUBES

The stability and high precision which make possible the sharp, clear magnifications of 200,000x and the extremely high resolving power provided by the RCA EMU-3 Electron Micro­ scope, can only be achieved by the use of tubes of the highest possible quality. Provide your circuits with the same kind of accuracy and depend­ ability. Specify RCA tubes throughout—there's one for virtually every application. See your Authorized RCA Distributor for immedi­ ate delivery. RCA Electron Tube Division, Harrison, N. J.

RCA

The Most Trusted Name in Electronics RADIO CORPORATION O F AMERICA

Circle No. 86 on Readers' Service Card 122 A

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ANALYTICAL CHEMISTRY

the world's standard instruments for precision measurement are Beckman Oxygen Analyzers... in biochemical research, food processing control, industrial applications, medical analyses and military applications. Choice of three basic models to fit any requirements for accuracy, types of samples to be analyzed and range of concentrations. S3 Model E2 is designed for the most exacting work,with flowing or static samples, in five ranges.uses 110 V AC power. Model C2, semiportable, also operates on 110 VAC, for flowing or static samples in a wide variety of ranges. Model D2 is portable, battery operated, for static samples in two ranges. S3 For complete specifications on these three laboratory instruments contact your Beckman dealer. Or write direct for Data File 15-4-05.

Beckman® Scientific and Process IInstruments Division Beckman Instruments, £500 Fulterton Road, Fulterton, California

Circle No. 124 on Readers' Service Card

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