HOPKINS. so obvious as to require little description. One of the bat- The microphone now exists in many fo.ius. and i'^ an ex- FinA tery wires terminates in a series of coils, F, and is attached ceeilingU' interesting instrument, although it has not, thus to the diaphragm above the middle. The… … NEW FOBM OF TELEPHONE. MICBOFHONE WITH 6BAFHITE BODS. low tides. That is, it is a dam which is set up against the far, attained the usefulness of the telephone. The several stream when the stream is low, diverting the water into a forms of microphone are easily constructed, but all, so far lock,…
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