THE TELEGRAPHONE | AdventAI

Pacific Press Publishing Company · Mountain View, California · Mar 13, 1907

FromSigns of the Times, Vol. 33, No. 11.

THE TELEGRAPHONE.

SPEECH is assured a wonderful way, we are told, in the development of the telegraphone, sometimes called the electro-magnetic phonograph. Instead of an impression by a stylus on a moving disc, a wire is run between two electro-magnets, which face each other at an interval of perhaps one-sixteenth of an inch. While passing, each tiny section has been magnetized with an intensity and polarity corresponding with the strength of the particular sound wave entering the instrument at that instant. The principle is that some change takes place in the grouping of the particles of metal as the wire is brought under the influence of the electro-magnet. The record completed, the spools are reversed and the switch turned to "hearing." As the magnetized wire is brought into connection with the magnets, the former acts as a magneto-generator, and the coils are electrified according to whether the original sound was strong or weak. The varying vibrations are communicated to the receiver, and the voice is reproduced. To use the wire a second time, all that is necessary is to run it thru for a second record, in the course of which the first record is entirely canceled.