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Whistle: Difference between revisions
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Many types exist, from small police and sports whistles (also called [[pea whistles]]), to much larger [[train whistle]]s, which are [[steam whistle]]s specifically designed for use on [[locomotive]]s and [[ship]]s. Although whistles have a musical characteristic (for example train whistles sound a [[Minor seventh chord|minor-seventh musical chord]]) whistles are not usually considered 'musical' in the sense of being able to play a chosen melody, but mainly the small whistles can also be used as a - very shrill and loud - [[noise instrument|noise]] and [[rhythm instrument]]. However, musical whistles exist, including any of several 2-[[octave]] musical instruments known as [[tin whistle]]s (sometimes known as pennywhistles or low whistles), as well as the [[calliope (music)|calliope]] (an array of separately actuable steam whistles), [[Organ (music)|organ]] pipes and the [[recorder]]. Pea whistles are used in [[jazz]] and [[Latin music]] as a [[percussion instrument]]. | Many types exist, from small police and sports whistles (also called [[pea whistles]]), to much larger [[train whistle]]s, which are [[steam whistle]]s specifically designed for use on [[locomotive]]s and [[ship]]s. Although whistles have a musical characteristic (for example train whistles sound a [[Minor seventh chord|minor-seventh musical chord]]) whistles are not usually considered 'musical' in the sense of being able to play a chosen melody, but mainly the small whistles can also be used as a - very shrill and loud - [[noise instrument|noise]] and [[rhythm instrument]]. However, musical whistles exist, including any of several 2-[[octave]] musical instruments known as [[tin whistle]]s (sometimes known as pennywhistles or low whistles), as well as the [[calliope (music)|calliope]] (an array of separately actuable steam whistles), [[Organ (music)|organ]] pipes and the [[recorder]]. Pea whistles are used in [[jazz]] and [[Latin music]] as a [[percussion instrument]]. | ||
The whistle works by causing the smooth flow of air to be split by a narrow blade, sometimes called a [[fipple]], creating a [[turbulence|turbulent]] [[vortex]] which causes the air to vibrate. By attaching a [[Acoustic resonance|resonant]] chamber to the basic whistle, it may be tuned to a particular note and made louder. The length of the chamber typically defines the resonant | The whistle works by causing the smooth flow of air to be split by a narrow blade, sometimes called a [[fipple]], creating a [[turbulence|turbulent]] [[vortex]] which causes the air to vibrate. By attaching a [[Acoustic resonance|resonant]] chamber to the basic whistle, it may be tuned to a particular note and made louder. The length of the chamber typically defines the resonant frequency. A whistle may also contain a small light ball, usually called the ''[[pea]]'', which rattles around inside, creating a [[chaos|chaotic]] [[vibrato]] effect that intensifies the sound. [[Japanese people|Japanese]] [[bird whistle]]s use several small balls and are half filled with water in order to reproduce the sound of a [[bird song]]. | ||
A steam whistle works the same way, but using steam as a source of pressure: such whistles can produce extremely high sound intensities. | A steam whistle works the same way, but using steam as a source of pressure: such whistles can produce extremely high sound intensities. | ||
