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| Picture No | 10215652 |
| Date | 1922 |
| Description | Taking thread: Sound-Waves on a Cord 1922 |
| Details |
Mr. W F Croll, who holds the parent, of a method of recording and reproducing sound-waves by means of a cellulose thread instead of by the generally known disc or cylinder record, saving space and weight.
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| Source | Photographs in 'The Illustrated London News', 29 July 1922, page 167 |
| Credit | © Illustrated London News Ltd/Mary Evans |
| Restrictions |
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