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Ti′dal a-larm′.

An audible alarm operated by the ebb and flow of the tide.

It is placed on a spit or shoal to warn off vessels during fogs, being on a vessel or buoy moored to the spot, or on a post or pile driven into the sand or shingle. It may be a bell, whistle, or trumpet, rung or blown by the impact of the passing tidal current. See fog-alarm

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