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Old 18th Jan 2022, 10:51 pm   #14
Join Date: Jun 2007
Location: Coulsdon, London, UK.
Posts: 1,644
Default Re: On-board ship communications

Some American ships had 'blinker' lights on either end of the yardarm.

They were used for non-directional communication and were operated by a telegraph key in the signal bridge.

Infra Red lights were mounted inboard of the blinkers and were used at night.

These were in addition to the searchlights operated by shutters that are often seen in the movies.
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