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Steam whistle
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Steam whistle : ウィキペディア英語版
Steam whistle

A steam whistle is a device used to produce sound with the aid of live steam, which acts as a vibrating system (compare to train horn).
== Operation ==
The whistle consists of the following main parts, as seen on the drawing: the whistle bell (1), the steam orifice or aperture (2), and the valve (9).
When the lever (10) is pulled (usually via a pull cord), the valve opens and lets the steam escape through the orifice. The steam will alternately compress and rarefy in the bell, creating the sound. The pitch, or tone, is dependent on the length of the bell; and also how far the operator has opened the valve. Some locomotive engineers invented their own style of whistling.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Steam whistle」の詳細全文を読む



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