The essential parts consist of a and, strange as it may appear, has been repeatedly transmitting diaphragm, to whose back a pencil or rod the claim is made that speech in all electric telephones sustained on such a basis by the courts. The inventor of carbon is attached, which projects from its… … current of this nature. A ‘“‘makeand break”. instrument, the image of the ball is seen to current, it is said by the Bell ad vocates,'can- jump back and forth from the pencil elec- THE BONTA TELEPHONE. trode, as it opens or breaks the circuit contin- not offitself transmit speech. The logical…
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![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten07unit-135-102.webp)
