Abstract
IN reproducing the experiments first made by Prof. Hughes with the microphone, I interposed in the circuit a galvanometer, and first found with the battery used (made with three small glass cones, as used by Prof. Hughes), when the microphone was not in the circuit, the current was sufficiently strong to deflect the needle to 40°. Now interposing the microphone, made of mercurised carbon peas in a small glass tube, it acted well as a transmitter only when the pressure on the carbon peas was so adjusted that the needle of the galvanometer stood about 15°.
This is a preview of subscription content, access via your institution
Access options
Subscribe to this journal
Receive 51 print issues and online access
$199.00 per year
only $3.90 per issue
Buy this article
- Purchase on SpringerLink
- Instant access to the full article PDF.
USD 39.95
Prices may be subject to local taxes which are calculated during checkout
Similar content being viewed by others
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
BROUN, W. The Microphone. Nature 18, 383 (1878). https://doi.org/10.1038/018383b0
Issue date:
DOI: https://doi.org/10.1038/018383b0
