File:Claveaux.png

...Les claveaux, dans l'architecture du moyen âge, étant toujours intradossés et extradossés, sauf de très-rares exceptions, il en résulte que les claveaux d'un même arc sont tous de même forme et de même dimension, ainsi que le démontre la fig. 1. A sont les sommiers, B la clef et C les claveaux...

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

	This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 100 years or fewer. This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.
This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights.

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