File:Fenetre.XIIIe.siecle.png

...Les architectes des églises de Saint-Denis, de la cathédrale de Troyes et de quelques autres monuments religieux élevés au milieu du XIII^e siècle, conservèrent la disposition générale indiquée dans la fig. 20, mais donnèrent pour plus de sûreté un champ égal, sinon une égale épaisseur, aux trois montants des grandes baies: c'est-à-dire (fig. 24)...

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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