Mr. G.L. Anders' telephone, shown in the accompanying cut, combines in a
single apparatus a transmitter, A, a receiver, B, and a pile, C. The
transmitter consists of a felt disk, a, containing several large
apertures, and fixed by an insulating ring, c, to a metallic disk, d,
situated within the box, D. The apertures, b, are filled with powdered
carbon, e, and are covered by a thin metal plate, f, which is fixed to
the insulating ring, c, by means of a metallic washer, g. Back of the
transmitter is arranged the receiver, B, which consists of an ordinary
electro-magnet with a disk in front of its poles. The pile, C, placed
behind the receiver, consists of a piece of carbon, h, held by a
partition, i, and covered with a salt of mercury, and of a plate of
zinc, l, which is held at a distance from the mercurial salt by a
spring, m, fixed to the insulating piece, n.
[Illustration: ANDERS TELEPHONE]
When the button, o, which is a poor conductor, is pressed, the zinc
plate, l, comes into contact with the mercurial salt, and the circuit is
closed through the line wire 1, the pile, the receiver, the transmitter,
and the line wire 2, while when the button is freed the current no
longer passes. The apparatus, then, can serve as a receiver or
transmitter only when the button is pressed.--_Bull. de la Musee de
l'Industrie_.
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