Science Fair Project Encyclopedia
A boatswain's pipe or boatswain's whistle (pronounced "Bosun") is a whistle that is made of a tube that directs air over a grape-sized metal sphere with a hole cut in the top. The player’s hand holds the sounding chamber and causes a change in the pitch by opening and closing the hand.
The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details