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But perhaps the greatest attraction of the magnetic system is its economy. Not only is the raw material quite cheap, but you can use it over and over again. If you make an unsuccessful experiment, you can erase the recording and the magnetic material is as good as new. Again, you can hire a silent film from a library, record suitable sound on a magnetic tape and show the film all in one day. Then next time you hire a film, you can erase the first recording and make a new one, suited to the new film. Since the tape may be used repeatedly, the cost of adding sound to a film is negligible.
You can even superimpose one recording on another quite simply.
It is not surprising that, with all these points in its favour, the magnetic tape recorder has become a commonplace in only a few years. The tape it uses is sometimes paper, sometimes plastic. You can mark it fairly readily for reference and if you break it, you can repair it without audible effect.
A tape recorder costs about as much as a good electric gramophone. Here again, you may be able to recruit financial support, for a tape recorder will provide the family with unlimited entertainment. Besides recording the voices of your family and friends, you can "tape" radio programmes for playback at more convenient times. It is tempting to record concerts and recitals containing works not available on records. This may however constitute an infringement of copyright (p. 137), and until the legal position has been defined, recording from the radio cannot be practised openly.
The recording is made in the dull brown or black coating of iron oxide on one side of the tape. The process consists simply of magnetising the oxide from point to point in proportion to the electrical impulses from the microphone. The tape thus magnetised holds the recording of all the sounds passed into the recording circuit. To reproduce the sound the tape is fed through the same recorder, but in such a way that the variations in the magnetic field are picked up
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