ケルン大聖堂リブ・ヴォールトNo.90の幾何学的解析(3)

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This paper is concerned with the geometrical analysis of Rib-Vault No90 of Cologne Cathedral. The rib vault consists of arches/ribs and the webs. This analysis is on the geometry of the transverse arches, wall arches and the cross rib. These arches and ribs were turned out to have two centers in the geometry of circle. We concluded that two centers shows two stages of construction in which final adjustment of loading stone occurred in webbing on the arches and rib. It seems that two stages concerns with the freehand construction method where the first stages is filling the vault (the lower webbing) and the second stages is the upper webbing. The repairing of the damaged Rib-Vault of Cologne Cathedral in the world war 2 is known to be executed the freehand construction which pictures shows.
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