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3. Note on a Variation of the Microphone

Published online by Cambridge University Press:  15 September 2014

R. M. Morrison
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Extract

Following out a suggestion made by Mr Seabrook in Nature of May 30th, I mounted the three carbon blocks of Professor Hughes' microphone on, not as Mr Seabrook recommends, a plate of 3 inches diameter, but on a ferrotype plate about 6 inches by 4. This plate formed part of the top of a box, thus—

Type
Proceedings 1877-78
Information
Proceedings of the Royal Society of Edinburgh , Volume 9 , 1878 , pp. 712
Copyright
Copyright © Royal Society of Edinburgh 1878

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