Blake transmitter

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“The transmitter is a microphone adapted for the transmission of telephone messages and, in general practice, is so used, better results being thus secured than is possible when the transmitter and receiver are identical. In the Blake transmitter, a diagram is supported back of a mouthpiece, as in the Bell telephone.”


Elroy M. Avery School Physics (New York: Sheldon and Company, 1895) 572


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