Invented by: Valdemar
initially, a telephone message-taking device; nowadays,
Poulsen's first magnetic recording device used wire and then
later, steel tape. It was
designed to record telephone messages.
In 1935 the first plastic recording tape was introduced; it
with iron oxide (tape today is often coated with chromium
oxide). Early tape
recorders were buky machines with the tape running from one
large reel to another.
In the 1960's Philips introduced the compact tape-cassette.
This was a complete, easy to handle, plastic
package of twin spools
and narrow recording tape.
The cassette led to Sony's invention, in 1979, of the
It was a complete, portable, stereo cassette player, little
larger than a cassette box. There was no room for a
loudspeaker, so earphones were provided, with tiny,
superefficient plastic membranes.
Now they're everywhere. And the sound reproduction is
excellent-except for outsiders!