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Dec 1934

Volume 5, Issue 12, pp. 411-450

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A Precision Recording Cosmic‐Ray Meter

A. H. Compton, E. O. Wollan, and R. D. Bennett

Rev. Sci. Instrum. 5, 415 (1934); http://dx.doi.org/10.1063/1.1751765 (8 pages) | Cited 35 times

Online Publication Date: 27 December 2004

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Abstract Unavailable

A Source of the Lyman Continuum for Use with Spectrographs of High Dispersion

George Collins and W. C. Price

Rev. Sci. Instrum. 5, 423 (1934); http://dx.doi.org/10.1063/1.1751766 (3 pages) | Cited 17 times

Online Publication Date: 27 December 2004

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Note on Life Tests of Commercial Type Standard Cells

T. Townsend Smith

Rev. Sci. Instrum. 5, 425 (1934); http://dx.doi.org/10.1063/1.1751767 (3 pages)

Online Publication Date: 27 December 2004

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Measurements of the electromotive force of standard cells made over periods of from seven to twenty years show that the electromotive force of the cells decreases at a rate which varies from cell to cell and which changes with the age of the cell. It seems further that a single cell may not be trusted unless it has been checked a short time previous to being used. These conclusions follow as the result of measurements where no attempt was made to keep the cells at a constant temperature.

A New Recording Dilatometer of High Sensitivity

A. Goetz, J. W. Buchta, and T. L. Ho

Rev. Sci. Instrum. 5, 428 (1934); http://dx.doi.org/10.1063/1.1751768 (4 pages) | Cited 1 time

Online Publication Date: 27 December 2004

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A Combined Recording Microphotometer, Densitometer and Comparator

Philip A. Leighton, Sinclair Smith, and Fred C. Henson

Rev. Sci. Instrum. 5, 431 (1934); http://dx.doi.org/10.1063/1.1751769 (4 pages) | Cited 6 times

Online Publication Date: 27 December 2004

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An instrument which may be used as a registering microphotometer, a direct reading densitometer and a comparator has been constructed. It utilizes a radiometer as the light‐sensitive device. Records are taken on 4 by 10 inch photographic plates, direct readings on a 50 cm scale, and intervals are read by means of a 10 inch comparator screw.

An Automatically Regulated Precision High Voltage Source

Otto H. A. Schmitt

Rev. Sci. Instrum. 5, 435 (1934); http://dx.doi.org/10.1063/1.1751770 (3 pages) | Cited 5 times

Online Publication Date: 27 December 2004

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It is frequently desirable to generate very steady high voltage direct current from low voltage alternating current obtained from a source subject to violent fluctuation. An instrument is described which will maintain output voltage constant to less than one percent so long as the supply voltage remains in the range between 95 and 165 volts. The variation of output voltage with changes in applied load is 0.1 percent per milliampere. The pure direct current output may be varied easily and reproducibly between 100 and 2200 volts.

Apparatus for Making Permeability‐Tension Tests

G. A. Kelsall and H. J. Williams

Rev. Sci. Instrum. 5, 437 (1934); http://dx.doi.org/10.1063/1.1751771 (4 pages) | Cited 1 time

Online Publication Date: 27 December 2004

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A device is described for making permeability‐tension tests on a ferromagnetic material in the form of a tape bent into a triangle. This form has the advantage over the usual straight one in that it forms a closed magnetic circuit to which tension can be easily applied. The magnetic measurements at low magnetizing forces are made by means of the Kelsall permeameter which obviates the necessity of winding a large number of turns of wire around the specimen. The magnetic measurements at high magnetizing forces are made in the customary manner with a ballistic galvanometer. The method is illustrated by tests on perminvar specimens.

Response of the Photronic Cell to Modulated Light Flux at Audiofrequencies

John H. Roe

Rev. Sci. Instrum. 5, 441 (1934); http://dx.doi.org/10.1063/1.1751772 (5 pages) | Cited 3 times

Online Publication Date: 27 December 2004

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Abstract Unavailable
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