A boatswain's call, pipe, or bosun's whistle is a pipe or a non-diaphragm type whistle used on naval ships by a boatswain. The pipe consists of a narrow tube (the gun) that directs air over a metal sphere (the buoy) with a hole in the top.
A boatswain's call, pipe, or bosun's whistle is a pipe or a non-diaphragm type whistle used on naval ships by a boatswain. The pipe consists of a narrow tube (the gun) that directs air over a metal sphere (the buoy) with a hole in the top.
Source: Wikipedia "Boatswain's call" · CC BY-SA 4.0
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