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Saddle roof has two meanings, one modern and one historical. The modern meaning is a roof form which follows a convex curve about one axis and a concave curve about the other. The hyperbolic paraboloid form has been used for roofs at various times since it is easily constructed from straight sections of lumber, steel, or other conventional materials.〔''A Dictionary of Architecture'', Fleming, Honour, Pevsner〕 The term is used because the form resembles the shape of a saddle. Sometimes referred to as a hypar, the saddle roof may also be formed as a tensegrity structure.〔''Membrane Structures: Understanding Their Forms'', Prof. Dr. Eng. M. Mollaert〕 Mathematically, a saddle shape contains at least one saddle point. The historical meaning is a synonym for a gable roof particularly a ''dual-pitched'' roof on a tower, also called a ''pack-saddle roof''.〔Passmore, Augustine C.. "Saddle Roof". ''Handbook of technical terms used in architecture and building and their allied trades and subjects'',. London: Scott, Greenwood, and Co.;, 1904. 303. Print.〕 ==Gallery== Image:Hyperbolic-paraboloid.svg|Hyperbolic paraboloid geometry as used in saddle roof construction. Image:Church Army chapel 042.jpg|Example of a saddle roof: Church Army Chapel, Blackheath. Image:PengrowthSaddledome.jpg| Example of a saddle roof: The Calgary Saddledome. Image:Pengrowth_Saddledome.jpg|Example of a saddle roof: The Calgary Saddledome. Image:London Velopark, 16 April 2012.jpg| Example of a saddle roof: the London Velopark. 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「saddle roof」の詳細全文を読む スポンサード リンク
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