Definition of "fog-signal" []

• Any signal made in foggy weather to prevent danger to ships or railroad-trains by collision or otherwise. (noun)

The Century Dictionary (Public Domain)

• "When he looked at his watch, it was half-past three in the morning, and the fog-signal was still hooting into the night."
• "And it is conceded that Mr. C.L. Daboll, under the direction of Prof. Henry, and at the instance of the United States L.ghthouse Board, first practically used it as a fog-signal by erecting one for use at Beaver Tail"
• "_ -- It appears from the evidence given in 1845, before the select committee raised by the English House of Commons, that the use of the locomotive-whistle as a fog-signal was first suggested by Mr.A. Gordon, C.E., who proposed to use air or steam for sounding it, and to place it in the focus of a reflector, or a group of reflectors, to concentrate its sounds into a powerful phonic beam."