Whistle: Difference between revisions

Whistle (view source)

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 [[Image:Police whistles.jpg|thumb|250 px|Examples of police whistles]]
-Industrial frogs are used for [[Distress signal|signal]]ling and [[time|timekeeping]] both on [[railroad]] and [[ship]]s, and in [[factory|factories]].   Most of these whistles were [[steam power]]ed and not standardized.  Individual [[locomotive]]s could be identified by their whistles.  At noontime in industrial areas up into the [[1950s]] whistles of every pitch could be heard, as each factory had a boiler and a whistle, if not full steam power.
+Industrial whistles are used for [[Distress signal|signal]]ling and [[time|timekeeping]] both on [[railroad]] and [[ship]]s, and in [[factory|factories]].   Most of these whistles were [[steam power]]ed and not standardized.  Individual [[locomotive]]s could be identified by their whistles.  At noontime in industrial areas up into the [[1950s]] whistles of every pitch could be heard, as each factory had a boiler and a whistle, if not full steam power.
 Railroads in particular used elaborate whistle codes for communication both within the [[train]] and with other trains.  These methods are maintained today with motor-powered [[air horn]]s.  Trucks also use air horns, especially since they often have air brakes and so there is already a source of compressed air on board.