Занимательная физика в вопросах и ответах. Сайт Елькина Виктора. Заслуженный учитель РФ. Учитель-методист.
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STORIES OF INVENTIONS AND DISCOVERIES

Tape Recorder (and Walkman)




Invented by: Valdemar Pousen
Nationality: Danish Date: 1898
Purpose: initially, a telephone message-taking device; nowadays, largely music recording
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 was coated 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 Walkman.
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!

Занимательная физика А знаете ли Вы? Физика в походе Биофизика Астрономия Радиотехника для всех Биографии Физика и поэзия Физика и медицина Народная мудрость Шаровая молния Необычные явления Бочка Паскаля Занимательные опыты Оптика Ссылки Сообразилки

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Mikhail
Lomonosov
Electric Light Bulb
Tape Recorder
(and Walkman)
Television

Telephone

Cameras in the Beginning