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Keywords from Image Description:
Embrasure.chateau.Bonaguil.. La partie extrieure de ces sortes d'embrasures tait promptement gueule par le souffle de la pice aussi pensaton leur donner plus d'air en couvrant l'brasement extrieur par un arc ViolletleDuc Drawings by Eugne ViolletleDuc Drawings of embrasures Medieval gunnery and artillery