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Dragon beam
Dragon beam is a horizontal, diagonal beam in the corner(s) of some traditional timber framed buildings. The term is commonly used in both hip roof framing and jettying. Older publications may use the synonyms dragging beam, dragging piece, dragging tie, dragon piece or dragon tie. Inconsistencies in modern usage are discussed below. In French it is called a coyer or enrayure.
==Etymology==
The etymology of dragon is unclear. The term may be descended from German träger (a carrier), Danish dragere (bearing beam, joist, girder) or Dutch draggbalk (beam). The origin has also been proposed as a corruption of diagonal or diagon.〔Miles Lewis, "Puncheons and Dragons:Renaissance carpentry and semantics" http://www.mileslewis.net/lectures/04-history-of-building/puncheons-and-dragons.pdf accessed 3/22/2013〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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