Whistle: Difference between revisions
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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. | 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. | ||
Whistles are often used as warning devices or as safety devices serving to attract attention to the user. Some [[cyclist]]s use a whistle as a substitute for a [[bell]] or [[horn]]. It should be noted, however, that many jurisdictions require that the warning device be permanently attached to the [[bicycle]]. | Whistles are often used as warning devices or as safety devices serving to attract attention to the user. Some [[cyclist]]s use a whistle as a substitute for a [[bell]] or [[horn]]. It should be noted, however, that many jurisdictions require that the warning device be permanently attached to the [[bicycle]]. [[Train whistle]]s generally produce three or four different frequencies at the same time, to produce a non-major chord, that is distinct, loud, and low in pitch. | ||
