Daylight control

From International Dictionary of Marine Aids to Navigation
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6-8-230

A device operated by daylight, that automatically controls a light source, lighting it at or about sunset and extinguishing it at or about sunrise.


Note: If the light source is an electric lamp the device is called a sun switch.

If the light source is a gas flame or a gas mantle, the device is called a sun valve or light valve.




Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

nertia of the water plane

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM