Un signe illustré décrivant comment une serrure a travaillé Great Falls en Virginie

• Contributeur: Susan Isakson / Alamy Banque D'Images
• ID de l’image: B04B2N
• Taille du fichier: 48 MB (2,3 MB Téléchargement compressé)
• Autorisations: Modèle - non | Propriété - non
• Dimensions: 3345 x 5018 px | 28,3 x 42,5 cm | 11,2 x 16,7 inches | 300dpi

Informations supplémentaires

How a Lock Worked—A boat going downstream entered the lock at its upper end. At the lower end a gate kept the water in. The upper gate was then closed. Valves in the lower gate were opened and the water level was lowered to the elevation of the next lock downstream. The lower gate was opened and the boat proceeded to the next lock. For boats going upstream, the procedure was reversed.

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