ne of the battery wires, and are fastened the Ohio River, to create a harbor six miles long for the ‘at suitable distances apart to the face of the diaphragm by an eet commerce of the city. SOME MODIFICATIONS OF THE MICROPHONE aND °° drop of sealing wax. <A fine copper wire is wound around , The… … MICROPHONE WITH GRAPHITE RODS. 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 forins of microphone are easily constructed, but all, so far | lock, after the manner of a…
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