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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Details
Creative#:
TOP23875898
Source:
達志影像
Authorization Type:
RM
Release Information:
須由TPG 完整授權
Model Release:
No
Property Release:
No
Right to Privacy:
No
Same folder images:
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