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Plan.nef.cathedrale.Bourges. Le plan de la nef dont nous prsentons quelques traves fig est driv d'une suite de triangles isocles rectangles La nef principale donne des carrs de deux en deux traves Quant aux nefs latrales doubles elles ont de mme engendres par la prolongation des ctes de ces triangles ViolletleDuc Drawings by Eugne