...Prenons donc comme exemple d'une des charpentes de combles les plus anciennes, celle du chœur de Notre-Dame de Paris; nous aurons ainsi, dans un petit nombre de figures, des fermes ordinaires, des chevrons portant fermes et une croupe. La fig. 8 donne le plan de la croupe qui couvre le chevet...

This image comes from Dictionary of French Architecture from 11th to 16th Century (1856) by Eugène Viollet-le-Duc (1814-1879) .

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