File:Clou.XIIe.siecle.png

...Ces traditions antiques se perdirent vers la fin du XII^e siècle, et depuis lors les clous simples ou ornés ne furent plus que des pièces de forge en fer. Il existe encore sur les vantaux de portes du XII^e siècle un grand nombre de clous dont la tête est forgée en pointe de diamant, et dont la tige, divisée en deux pointes, est rivée sur les traverses, ainsi que l'indique la fig. 3...

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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