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A Geiger‐Müller counter with a spherically shaped cathode is described. The pulse shape from this counter is similar to that of cylindrical counters. It may be used satisfactorily in ordinary coincidence work. Some of the counters, slightly modified to avoid spurious discharge, were filled...
This paper is concerned with certain aspects of the technique of all‐metal, kinetic vacuum systems which have proven their reliability. A brief account is given of the constitution of a system to operate down to pressures of the order of 10 −5 mm. Precautions to be observed in assembling such...
The object of this study was the development of a portable self‐contained instrument which would record the rates of inspiratory air flow through protective canisters under actual field conditions. This instrument was developed so that observations made in the laboratory could be checked under...
This paper describes the construction and performance of a differential manometer with a sensitivity of 0.001 mm of mercury over the range of absolute pressures from 1 mm of mercury to 1 atmosphere. The sensitive element employed is a pair of nesting diaphragms, displacement of which is measured...
Design and operating characteristics of an electronic device for measuring over‐all efficiencies of Geiger counters are provided. The device will rapidly, and without any standard tube, yield these data as well as provide a means of checking the relative sensitivity of various sections of a...
A quenching circuit is described that works on the multivibrator principle but uses two different grids of the input tube for the signal and for the regenerative feedback. The initial discharge in the counter excites the counter to one oscillation during which the counting voltage is kept below...
An investigation of the factors which influence the opening time of Fussell‐type cloud‐chamber valves has been made. In particular, the action of auxiliary triggering coils has been examined. The feasibility of constructing such a valve which is held shut by a permanent magnet is...
A glow tube with thorium electrodes can be used to measure the intensity of ultraviolet light. The simple circuit used for this purpose does not give reliable results for photo‐currents below 10 −10 amp., and the exposure time to light may become several hours. The writer has devised certain...
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