Picture No | 10724317 |
Date | |
Description | How wireless beacons guide ships in the fog |
Details |
The Marconi invention can determine distance of the ship from the beacon to steer the vessel into a Harbour during foggy weather. The shore transmitter operates on wave-lengths of about 60 centimetres, and its signals are received in two ways on board ship, one by headphones or loud-speaker, and the other by the movement of a needle on the galvanometer-dial fixed in a prominent postion before the navigator.
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Source | Illustration by George Horace Davis in ‘Inside Knowledge’ |
Credit | © Illustrated London News Ltd/Mary Evans |
Restrictions |
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