carbon microphone
noun
A microphone depending for its action on the varying electrical resistance of carbon granules when subjected to the varying pressure of sound waves.
Origin
Late 19th century; earliest use found in Telegraphic Journal.
| 单词 | carbon microphone |
| 释义 | carbon microphonenoun A microphone depending for its action on the varying electrical resistance of carbon granules when subjected to the varying pressure of sound waves. Origin |
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