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May 1930

Volume 1, Issue 5, pp. 267-308


A CONSTANT FREQUENCY OSCILLATOR

Carl W. Miller and Howard L. Andrews

Rev. Sci. Instrum. 1, 267 (1930); http://dx.doi.org/10.1063/1.1748690 (10 pages) | Cited 3 times

Online Publication Date: 17 December 2004

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The frequency of a vacuum tube oscillator depends not only upon the constants of the oscillating circuit but also upon those of the tube itself. In a tuned plate circuit, operating with minimum coupling the influence of the tube on frequency depends only on its plate resistance, and decreases as the plate resistance is increased. The steady drift in frequency usually observed is due mainly to the effect on the plate resistance of progressive changes in the filament. Due to their rugged filaments the UX852 and the screen grid UX860 have been found particularly suitable for steady oscillators.
Two methods of compensating for small changes in plate voltage and filament emission are described. A curve is included showing the effect of temperature on the frequency of the oscillator. The apparatus used for this precise study of small frequency changes is described. One of its most valuable features is an audio oscillator which is controlled by a vibrating string.

NOTE ON A MODIFIED RANDALL UNIVERSAL CALIBRATION CURVE FOR BALLISTIC GALVANOMETERS

Richard H. Frazier

Rev. Sci. Instrum. 1, 277 (1930); http://dx.doi.org/10.1063/1.1748691 (4 pages)

Online Publication Date: 17 December 2004

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An experimental‐graphical method is given for the determination of the critical damping resistance of a ballistic galvanometer. The curve used turns out to be a modification of the Randall Universal Calibration Curve which can be represented in the region of underdamping by a very readily drawn straight line with a maximum error of 1.8 percent.

A VACUUM TUBE ELECTROMETER

H. Nelson

Rev. Sci. Instrum. 1, 281 (1930); http://dx.doi.org/10.1063/1.1748692 (4 pages) | Cited 3 times

Online Publication Date: 17 December 2004

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Abstract Unavailable

THE USE OF THE GRID GLOW TUBE IN A THERMOREGULATOR

James H. Hibben

Rev. Sci. Instrum. 1, 285 (1930); http://dx.doi.org/10.1063/1.1748693 (4 pages)

Online Publication Date: 17 December 2004

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Abstract Unavailable

A SODIUM‐ARGON GLOW‐TUBE

Herbert J. Reich

Rev. Sci. Instrum. 1, 289 (1930); http://dx.doi.org/10.1063/1.1748694 (3 pages)

Online Publication Date: 17 December 2004

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Abstract Unavailable

A NEW RESEARCH MICROSCOPE

W. L. Patterson

Rev. Sci. Instrum. 1, 292 (1930); http://dx.doi.org/10.1063/1.1748695 (3 pages)

Online Publication Date: 17 December 2004

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Abstract Unavailable

A RATIOMETER

W. A. Parlin

Rev. Sci. Instrum. 1, 295 (1930); http://dx.doi.org/10.1063/1.1748696 (2 pages)

Online Publication Date: 17 December 2004

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Abstract Unavailable

A POINT‐SOLDERING PENCIL

Urner Liddel

Rev. Sci. Instrum. 1, 297 (1930); http://dx.doi.org/10.1063/1.1748697 (2 pages)

Online Publication Date: 17 December 2004

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Abstract Unavailable

A SIMPLE MANOMETER AND SOURCE FOR HOT VAPORS

C. T. Zahn

Rev. Sci. Instrum. 1, 299 (1930); http://dx.doi.org/10.1063/1.1748698 (3 pages) | Cited 3 times

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, 303 (1930); http://dx.doi.org/10.1063/1.1748699 (6 pages)

Online Publication Date: 17 December 2004

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Abstract Unavailable
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