fog gun

noun

1. a gun, fired at regular intervals, used as a warning signal in fog.

Example Sentences

A federal officer with what appeared to be a fog gun walked up and down the fence line, spraying a caustic chemical at the people standing there.

From Washington Post

To avoid being tied down by sewage pipes, the bathroom was as nearly waterless as a bathroom can be; a ten-minute "bath" was supplied from a quart of water by means of a Fuller invention called a "fog gun," and provision was made for even this water to be recollected from the air.

From Time Magazine Archive

But even admirers who liked the thought of rubber floors on which children could not be hurt, or the fog gun for washing dishes, judged Mr. Fuller's proposal that the house be set up by being dropped from a Zeppelin a little visionary.

From Time Magazine Archive

Admiral Sir A. Milne said he had often gone into Halifax harbor, in a dense fog like a wall, by the sound of the Sambro fog gun.

From Project Gutenberg