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conical roof
A conical roof or cone roof is a roof shape, that is circular on plan and rises to terminate in a point, the whole forming a regular cone in shape. They are frequently found on top of towers in medieval town fortifications and castles, where they may either sit directly on the outer wall of the tower (sometimes projecting beyond it to form eaves) or form a superstructure above the fighting platform or terrace of the tower. The latter necessitated the use of spouts to lead the water away over the top of the walls (e.g. as at Andernach's ''Alter Krahnen''). In this case the cone roof was surrounded by a protective wall, a parapet or a battlement. Conical roofs were usually constructed using a timber-framed support structure covered with slate; more rarely they were made of masonry.
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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