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The Barker lever is a pneumatic system which multiplies the force of a finger on the key of a tracker pipe organ. It employs the wind pressure of the organ to inflate small bellows called "pneumatics" to overcome the resistance of the pallets (valves) in the organ's wind-chest . This lever allowed for the development of larger, more powerful organs still responsive to the human hand. These larger organs first flourished in France, e.g., the organ produced by Cavaillé-Coll at St. Sulpice. This "contrivance" was named after Charles Spackman Barker (1804-79), engineer and organ-builder. A similar lever was developed by David Hamilton in 1835, and there has been debate whether Barker stole the design. The rest of Barker's career was undistinguished. ==Bibliography== * George Laing Miller: "The Recent Revolution in Organ Building", 1913, chapter III * Compares Barker-lever to similar devices in the Corliss steam engine. He cites the Grove's article below and other good web sources, e.g. Bridgeman-Sutton. * David Bridgeman-Sutton: ("Barker-lever" ). This is based on the following two print sources, Hinton suggesting Barker's copying & Thistlethwaite noting the differences in design. * John William Hinton: The Story of the Electric Organ. London: Simpkin, Marshall, Hamilton, Kent & Co., 1909. * Nicholas Thistlethwaite: The Making of the Victorian Organ. Cambridge Musical Texts and Monographs. Cambridge: Cambridge University Press, 1990. Pp. 352–354. * P. Williams: "Organ." The New Grove Dictionary of Music & Musicians. (Stanley Sadie, ed.), vol. 13, New York: Macmillan, 1995, pp. 710–779. * Hans Dieter Meyer: ''Buchholz und Haupt, oder: Wie der Barkerhebel nach Deutschland kam''. In: Ars organi 52 (2004). ISSN 0004-2919 * Duncan Mathews, ''Charles Barker's Wondrous Machines''. In: Organ builder 5 (2008), 17-20. 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「Barker lever」の詳細全文を読む スポンサード リンク
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