It was discovered by an inventor
several years ago, while experimenting in telephony.
"There are no disks or cylinders of wax, as in the phonograph, but
two large spools of extremely fine steel wire. The record is not
made mechanically on a cylinder, but electromagnetically on this
wire. Small portions of magnetism are imparted to fractions of the
steel wire as it passes between two carbon electric magnets. Each
impression represents a sound wave. There is no apparent
difference in the wire, no surface abrasion or other change, yet
each particle of steel undergoes an electromagnetic transformation
by which the sound is indelibly imprinted on it until it is wiped
out by the erasing magnet. There are no cylinders to be shaved;
all that is needed to use the wire again is to pass a magnet over
it, automatically erasing any previous record that you do not wish
to preserve. You can dictate into it, or, with this plug in, you
can record a telephone conversation on it. Even rust or other
deterioration of the steel wire by time will not affect this
electromagnetic registry of sound.
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