Picture No | 10215502 |
Date | 1844 |
Description | Marine telephone |
Details |
A telephone or 'marine alarum' being used by a sailor. This worked on the principle of sending air through a series of valves and pistons to make various notes, which were then translated into messages. The idea was to prevent collisions at sea and other accidents.
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Source | The Illustrated London News, 24 August 1844, page 117 |
Credit | © Illustrated London News Ltd/Mary Evans |
Restrictions |
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