At A is a mouthpiece before which the
musician hums his part as upon a reed pipe. He causes the plate, B, to
vibrate in unison with the sound that he emits, and this produces
periodical interruptions of varying rapidity between the disk, B, and
the point, C. The button, D, serves to regulate the distance in such a
way that the breakings of the circuit shall be very complete and
produce sounds in the receivers as pure as allowed by this special
mode of transmission, in which all the harmonics are systematically
suppressed in order to re-enforce the fundamental.
[Illustration: FIG. 2.--DETAILS OF THE TRANSMITTER.]
This transmitter interrupter is interposed in the circuit of a battery
of accumulators, with the five receivers that it actuates, in such a
way that the four transmitters and five receivers form in reality four
groups of distinct autonomous transmission, the accordance of which is
absolutely dependent upon that of the artists who make them vibrate.
The five receivers are arranged over the front door of the telephone
pavilion, near the Eiffel tower (Fig. 3). Each consists of a horseshoe
magnet provided, between its branches, with two small iron cores
having a space of a few millimeters between them (Fig. 4). Each of
these soft iron cores carries a copper wire bobbin, N, the number of
spirals of which is properly calculated for the effect to be produced.
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