File:Naissance.voute.arete.romane.png

...Il fallait une assiette à ces formerets, un point d'appui particulier; les constructeurs romans ajoutèrent donc, à cet effet, un nouveau membre à leurs piles, et la voûte d'arête [sic] prit naissance dans l'angle rentrant formé par le sommier de l'arc doubleau et celui du formeret, ainsi que l'indique la fig. 10. A est l'arc doubleau: B le formeret, C l'arête de la voûte; le plan de la pile est en D...

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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