Bare two line. with the view of producing an articulating telephone, car- " This, therefore, is the arrangement I have adopted in my .magnetized tuning forks, having the same rate of vibration rying on both series simultaneously. present form of apparatus, which I call the carbon telephone, TUB… … was devised in September, 1875, and is shown in Fig. 1, " Besides serving to operate the call bell, the local battery, two tuning forks, A and B, vibrating from 100 to 500 times and placed at two terminal stations. Electro-magnets, m and E, is also used for sending the call signal. S is a switch.…
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