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. A whistle is a one-note woodwind instrument which produces sound from a stream of forced air. ... Species Vitis acerifolia Vitis aestivalis Vitis amurensis Vitis arizonica Vitis x bourquina Vitis californica Vitis x champinii Vitis cinerea Vitis x doaniana Vitis girdiana Vitis labrusca Vitis x labruscana Vitis monticola Vitis mustangensis Vitis x novae-angliae Vitis palmata Vitis riparia Vitis rotundifolia Vitis rupestris Vitis shuttleworthii Vitis tiliifolia Vitis...

The historical use of the boatswain's pipe was as a signaling device on a ship. Because of its high pitch, it could be heard over the activities of the crew and bad weather. Note that Bosun, spelled that way, is the NATO reporting name for the Soviet Tupolev Tu-14 bomber. ... The word pipe can refer to: The basic cylindrical pipe shape a tubular man-made channel, generally round in cross section, in steel or concrete for transporting or guiding a fluid substance see plumbing and pipeline transport used in construction as column, truss element or space frame in mechanical engineering... A signal may refer to: an abstract element of information, or, more exactly, usually a flow of information (in either one or several dimensions). ... Italian barque Amerigo Vespucci in New York harbor, 1976. ...