Compressed-air diaphragm horn

From International Dictionary of Marine Aids to Navigation
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3-2-150

Compressed-air (diaphragm) horn

A fog signalling apparatus comprising a resonant horn excited at its throat by impulsive emissions of compressed air regulated by an elastic diaphragm.




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

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