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Bald arch Bald arch is a technical term used by engineers to describe the decay of the crucial keystones in medieval buildings, particularly churches and cathedrals. == Causes and symptoms ==
Many attribute the decay to low pitch vibrations produced by late 19th Century pipe organs, the proliferation of the 32 feet pipe particularly responsible, although some blame the vibrations from inner city traffic. The stone becomes crumbly, producing a fine powdered stone. Also, large sections loosen and often fall off, creating another hazard.
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「Bald arch」の詳細全文を読む
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