In the wonder world of electronics, much of the magic is performed by a simple looking devicea plastic ribbon covered with particles of iron oxide. Its name: magnetic tape. On its surface a fantastic amount of sights, sounds and statistical data can be electromagnetically recorded. The tape can be played over and over again without wearing out, can be erased and used again for new recordings. Tape recorders are challenging phonographs for hi-fi music; they fly in jet planes and guided missiles to record test data; in the first earth satellite, a...
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