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bellows : ウィキペディア英語版
bellows

A bellows or pair of bellows is a device constructed to furnish a strong blast of air. The simplest type consists of a flexible bag comprising a pair of rigid boards with handles joined by flexible leather sides enclosing an approximately airtight cavity which can be expanded and contracted by operating the handles, and fitted with a valve allowing air to fill the cavity when expanded, and with a tube through which the air is forced out in a stream when the cavity is compressed.〔(English Dictionary, 2nd ed: bellows )〕 It has many applications, in particular blowing on a fire to supply it with air.
The term "bellows" is used by extension for a flexible bag whose volume can be changed by compression or expansion, but not used to deliver air. For example, the light-tight (but not airtight) bag allowing the distance between the lens and film of a folding photographic camera to be varied is called a bellows.
==Name==

"Bellows" is only used in plural. The Old English name for 'bellows' was blǽstbęl(i)g, blást-bęl(i)g 'blast-bag, blowing-bag'; the prefix was dropped and by the eleventh century the simple bęlg, bylg, bylig ('bag') was used. The word is cognate with "belly".〔 There are similar words in Old Norse, Swedish, and Danish, but the derivation is not certain. 'Bellows' appears not to be cognate with the apparently similar Latin ''follis''.〔

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「bellows」の詳細全文を読む



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