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An Acoustical Galvanometer for the Measurement of Small Alternating Currents

An Acoustical Galvanometer for the Measurement of Small Alternating Currents Acoustic Alternating Current Galvanometer .—(1) Description . By sending the current through a telephone receiver, magnifying the emitted sound by means of a double resonator and measuring the intensity of the sound by means of a Rayleigh disk hung in the tube connecting the resonating chambers, a measure of the alternating current is obtained in terms of the rotation of the disk. (2) Variation of the sensitivity with frequency was investigated with the help of a hot wire ammeter. For the particular instrument studied maxima were found at frequencies of the resonator and telephone diaphragm. The sensitivity for 510 was about 5.7 × 10 - 8 amperes. Probably a much more sensitive instrument could be made by using sharper resonance and a more delicate quartz suspension. Measurement of intensity of pure telephone sounds could be effected by means of the above instrument if the frequency used is known as well as the corresponding sensitivity. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review American Physical Society (APS)

An Acoustical Galvanometer for the Measurement of Small Alternating Currents

Watson, F. R; Ham, L. B
Physical Review , Volume 18 (3) – Sep 1, 1921
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Publisher
American Physical Society (APS)
Copyright
Copyright © 1921 The American Physical Society
ISSN
1536-6065
DOI
10.1103/PhysRev.18.178
Publisher site
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Abstract

Acoustic Alternating Current Galvanometer .—(1) Description . By sending the current through a telephone receiver, magnifying the emitted sound by means of a double resonator and measuring the intensity of the sound by means of a Rayleigh disk hung in the tube connecting the resonating chambers, a measure of the alternating current is obtained in terms of the rotation of the disk. (2) Variation of the sensitivity with frequency was investigated with the help of a hot wire ammeter. For the particular instrument studied maxima were found at frequencies of the resonator and telephone diaphragm. The sensitivity for 510 was about 5.7 × 10 - 8 amperes. Probably a much more sensitive instrument could be made by using sharper resonance and a more delicate quartz suspension. Measurement of intensity of pure telephone sounds could be effected by means of the above instrument if the frequency used is known as well as the corresponding sensitivity.

Journal

Physical Review – American Physical Society (APS)

Published: Sep 1, 1921

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