...Nous trouvons, au-dessus des arcs-boutants de la nef de la cathédrale de Sées (1230 environ), une disposition analogue, mais préférable à celle adoptée à Bayeux, en ce que les contre-forts contenant les conduites de chute des eaux du grand chéneau ne sont que des coffres, des appendices crevés à leur base verticalement, sans coudes ni ressauts, de manière à éviter tout engorgement. Voici (4) en A la section horizontale de ces conduites, en B leur élévation perspective, en C la coupe sur l'axe de la conduite...

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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