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A whistle is a quarter-wave generator, which means that a sound wave generated by a whistle is about four times the whistle length. If the speed of sound in the steam supplied to a whistle were 15936 inches per second, a pipe with a 15-inch effective length blowing its natural frequency would sound near middle C: 15936/(4 x
Steam whistles were also used as a warning device if a supply of steam was present, such as a sawmill or factory. These were common before fire sirens became widely available, particularly in the former Soviet Union. Fire horns, large compressed air horns, also were and still are used as an alternative to a fire siren.
Calliope on the Minne-Ha-Ha, a stern-wheeler on Lake George, New York Kitch Greenhouse Steam Calliope at the Ohio Historical Society – July 2006 Fairground calliope trailer being hauled by a U.S.-built traction engine – New Orleans Mardi Gras 2007 Steam calliope (c. 1901) built by George Kratz and used on the showboat French's New Sensation at The Mariners' Museum
North American steam locomotive whistles have different sounds from one another. They come in many forms, from tiny little single-note shriekers to larger plain whistles with deeper tones (a deep, plain train whistle is the "hooter" of the Norfolk & Western, used on their A- and Y-class Mallet locomotives). Even more well known were the multi ...
Listening to the York Factory Whistle Concert early Christmas morning has been a tradition for generations. The concert, which features eerie-sounding holiday songs, is set for 12:10 a.m. on Dec ...
The AOL.com video experience serves up the best video content from AOL and around the web, ... Pony Stands Very Still as Little Boy Falls Sound Asleep on Its Back. ABC News Videos. Bird flu virus ...
Steam whistle from a supertanker, in Merseyside Maritime Museum, United Kingdom. An air horn is a pneumatic device designed to create an extremely loud noise for signaling purposes. It usually consists of a source which produces compressed air, which passes into a horn through a reed or diaphragm. The stream of air causes the reed or diaphragm ...
Whistles were used by police in the 19th century. Steam whistles have been used on locomotives, ships, and in factories as alarm devices. With the advent of electricity, a variety of other alerting devices have been invented, such as buzzers , klaxons , sirens , horns , flashing and coloured lights, and other all-purpose alarms.