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Quick Facts:
Information on how it works:The telegraphone was invented in 1898 by Valdemar Poulsen. It was modified by Louis Blattner in 1930 to make the tape recorder The tape recorder can replay voices and music
on tape cassettes by using magnetic tape. If you insert a cassette,
the centers of the tape spools fit over the spindles. By pressing
play, it brings it brings the record/replay head in to contact
with the tape, which replays the sound. If you record, it erases
any previous recordings. Drive Mechanism:
a device driven by a motor in the player move the tape from one
spool to another. Erase head: An
electric signal is fed to the erase head when recording. It produces
a magnetic field that disorients the magnetic particles, erasing
the previous recording. Pressure Pad:
The pressure pad is mounted in the cassette , and presses the
tape against the playback head when the cassette is put into
the player. Record/Replay head:a
coil of wire is wound around each core making an electromagnet,
which produces electric signals and go into loudspeakers and
earphones to make sounds. Stereo Tracks: The stereo tracks are put around each side of an analog tape so the cassette can be turned over.
Macauly, David, The Way Things Work 1998, pg 244-245
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