Abstract
FOR many years past it has been the practice with broadcasting organisations to record sound programmes for reproduction as and when required. In some cases this technique makes use of ordinary gramophone records or of metal disks coated with a preparation of cellulose acetate. In other cases, the sound programme to be recorded is made to influence the longitudinal magnetization of a continuous steel tape which passes under the recording head. This latter process is suitable for long programmes, which can either be reproduced immediately or after an interval, the tape being rewound and passed under a suitable magnetic pick-up. The recording can afterwards be effaced or 'wiped off' the steel tape by a demagnetization or saturation process, and the tape can thus be used many times for different programmes.
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New Method of Sound Recording. Nature 157, 71–72 (1946). https://doi.org/10.1038/157071d0
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DOI: https://doi.org/10.1038/157071d0