XI. A selective hot-wire microphone | Philosophical Transactions of the ... [PDF]

In its original form, the detector was intended to respond to heavily damped aerial vibrations, such as those produced b

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XI. A selective hot-wire microphone W. S. Tucker, D. Sc., A. R. C. Sc., E. T. Paris, M. Sc. (Lond.) Published 1 January 1921. DOI: 10.1098/rsta.1921.0011 Article Info & Metrics eLetters

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1 January 1921

Extract

Volume 221, issue 582-593

The instrument described in the following paper provides:— (i) A convenient means of detecting a note of given pitch when other sounds are present; and (ii) A method of estimating the relative intensities of

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sounds of the same pitch. The idea which formed the starting-point for the construction of the instrument—viz., the placing of an electrically heated grid of fine platinum wire in the orifice of an otherwise closed vessel—was

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originally employed by one of us (W. S. T.) in the construction of a sound-

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detector for the use of Sound Ranging Sections in the British Army. In its

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original form, the detector was intended to respond to heavily damped

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aerial vibrations, such as those produced by the firing of guns. Further

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experiments, however, showed that the detector could be tuned to respond to any continuous sound of definite frequency by suitably Article

choosing the dimensions of the vessel and its orifice.

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This text was harvested from a scanned image of the original document using optical character recognition (OCR) software. As such, it may contain errors. Please contact the Royal Society if you find an error you would like to see corrected. Mathematical notations produced through Infty OCR.

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Received November 2, 1920.

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