Boatswain's call
Whistle used for communication onboard naval ships
Boatswain's call
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. The player opens and closes the hand over the hole to change the pitch. The rest of the pipe consists of a "keel", a flat piece of metal beneath the gun that holds the call together, and the "shackle", a keyring that connects a long silver or brass chain worn around the collar when in ceremonial uniform.
Read on Wikipedia · Image ThoKay 21:11, 18 August 2007 (UTC), CC BY-SA 3.0
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