fog signal

noun

any of various types of signal used as a warning by vessels navigating in fog or mist.

fog signal

a signal used to warn railway engine drivers in fog, consisting of a detonator placed on the line

First recorded in 1750–60

Timed by pulsebeats, it struck once every fifteen seconds or thereabouts: undoubtedly the fog signal of some minor light-house.

You know we're on government waters here and the pilot rules require us to keep a fog signal sounding once every minute.

He could not hear the lighthouse fog-signal at all, now, and the waves were much bigger under the boat.

A gun-cotton explosive fog signal is attached to the lantern.

Since that date an explosive gun-cotton fog signal has been erected, the bells being removed.

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