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Aug 1930

Volume 1, Issue 8, pp. 427-486


AWARD OF PRIZE FOR 1929

Rev. Sci. Instrum. 1, 427 (1930); http://dx.doi.org/10.1063/1.1748713 (2 pages) | Cited 1 time

Online Publication Date: 17 December 2004

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Abstract Unavailable

A THEORETICAL AND EXPERIMENTAL STUDY OF THE RESONANCE RADIOMETER

James Daniel Hardy

Rev. Sci. Instrum. 1, 429 (1930); http://dx.doi.org/10.1063/1.1748714 (20 pages) | Cited 16 times

Online Publication Date: 17 December 2004

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A galvanometer system for the measurement of very small voltages, of the order of 10−11volts, is described and its application to the measurement of feeble radiations with a thermocouple discussed. It has been found that energies of the order of 1/200 of that previously detected by other devices could be measured with the Resonance Radiometer. The effect of the Brownian Movement on the system has been calculated and has been found to be about 1/200 that of the effect on the ordinary galvanometer.
An experiment is described for the measurement of the speed of action of thermocouples, and results on the splashed filament type are recorded.

PRECISE MEASUREMENT OF SHORT TIME INTERVALS BY USE OF THE MICROCHRONOGRAPHIC WHEEL

George R. Town

Rev. Sci. Instrum. 1, 449 (1930); http://dx.doi.org/10.1063/1.1748715 (17 pages) | Cited 1 time

Online Publication Date: 17 December 2004

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Apparatus and methods are described by which time intervals may be measured to a precision of twenty microseconds. The duration of the time interval may be anything between twenty microseconds and ten seconds or even longer. The record obtained is continuous, making it possible to locate any event within the time interval to this same precision. The method is not limited to the measurement of electrical quantities. The application of the method to the determination of the speed of a rotating shaft is given in detail.

AN AMPLIFIER FOR MEASURING SMALL CURRENTS

Ralph D. Bennett

Rev. Sci. Instrum. 1, 466 (1930); http://dx.doi.org/10.1063/1.1748716 (5 pages) | Cited 3 times

Online Publication Date: 17 December 2004

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An amplifier is described which uses a four electrode tube of the ordinary type, and gives maximum current sensitivities of the order of 10−18 amperes. A novel feature consists in using as grid leak the positive ion emission of the filament.

AN ELLIPTICAL REFLECTOR FOR INTENSIFYING OPTICALLY EXCITED MERCURY RADIATION

Robert N. Wolfe

Rev. Sci. Instrum. 1, 471 (1930); http://dx.doi.org/10.1063/1.1748717 (2 pages)

Online Publication Date: 17 December 2004

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Abstract Unavailable

AN EXPERIMENTAL X‐RAY TUBE

W. M. Roberds

Rev. Sci. Instrum. 1, 473 (1930); http://dx.doi.org/10.1063/1.1748718 (6 pages) | Cited 1 time

Online Publication Date: 17 December 2004

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Abstract Unavailable

THIN SULPHUR LAYERS

Donald K. Berkey

Rev. Sci. Instrum. 1, 479 (1930); http://dx.doi.org/10.1063/1.1748719 (1 page)

Online Publication Date: 17 December 2004

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Abstract Unavailable

ABSTRACTS OF ARTICLES RELATING TO NEW INSTRUMENTS AND METHODS

Rev. Sci. Instrum. 1, 480 (1930); http://dx.doi.org/10.1063/1.1748720 (7 pages)

Online Publication Date: 17 December 2004

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Abstract Unavailable
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