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An amplifier is described which is suitable for the amplification of signals from a radiation thermocouple used with a low‐frequency interrupter. The system consists of a galvanometer which may be tuned by feedback over the range 1 to 3 cps, followed by a tuned electronic amplifier covering the...
A fractionating catalytic converter for the production of liquid para ‐hydrogen is described. The purpose of the fractionating column is to permit the use of a partial converter in the main liquefier stream at temperatures in the range of liquid nitrogen and yet avoid the possibility of back...
A precision grinding machine was constructed to permit the study of diffusion in germanium. Because one may obtain data after mean penetrations of the order of 10μ, this instrument is useful for problems involving very small diffusion coefficients and radioactive tracers of very short...
The conductance manometer is designed to measure and record rapid changes of pressure in liquid systems. The manometer is symmetrical with respect to its moving member and is liquid filled throughout; it is therefore specially adapted to the measurement of differential pressures. Sensitive...
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