![]() Piston bellows developed in Southeast Asia (probably by the Austronesian peoples) using the principles of the similarly indigenous fire piston.Accordion bellows, with the characteristic pleated sides, have been used in Europe for many centuries.Pot bellows were used in ancient Egypt.Box bellows were and are traditionally used in East Asia.Various kinds of bellows are used in metallurgy: The bellows are used to deliver additional air to the fuel, raising the rate of combustion and therefore the heat output. Several processes, such as metallurgical iron smelting and welding, require so much heat that they could only be developed after the invention, in antiquity, of the bellows. 'Bellows' appears not to be cognate with the apparently similar Latin follis. There are similar words in Old Norse, Swedish, and Danish and Dutch (blaasbalg), but the derivation is not certain. 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. Old bellows used on goldfield near Milparinka, N.S.W., Australia. 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.Įtymology A preserved baker's bellows at Deutsches Werkzeugmuseum (German Tools Museum) at Remscheid. ![]() 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. ![]() It has many applications, in particular blowing on a fire to supply it with 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. Diagram of a fireplace hand-bellowsĪ bellows or pair of bellows is a device constructed to furnish a strong blast of air. ![]() For other uses, see Bellows (disambiguation). ![]()
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