Boatswain WhistleA Boatswain's whistle or also known as a 'bosun' or pipe whistle, is historically a naval tool. This is because it carries further than a voice over the noise of the sea. Traditionally it was used to give orders, bugle calls and ceremonies. To use it simply blow into the end. The air is directed down the pipe and over the metal sphere. You can open and close your hand over the hole to change the pitch. The whistle comes with a key ring that you can