New Method of Fortification by Sluices

[...they] can pass into the chamber original: "receptacle". In hydraulic engineering, this refers to the lock chamber, the enclosed space where water levels are raised or lowered.; once they are inside, one closes the small Sluice original: "Escluse". Here referring to a smaller bypass valve or culvert used to regulate water flow without opening the main gates. C D E, as well as the two gates at A, and one opens the small Sluice F G H, allowing the water to flow out of the chamber until it is as low as the inner water, so that one may open the gates at B by hand, and the Ships pass into the Country meaning further inland, past the coastal or river defenses.. From what I have said here regarding the entry of Ships, one can sufficiently understand the manner of their exit.

A detailed engineering plan of a canal lock system. The diagram shows a central hexagonal "receptacle" or lock chamber positioned between two sets of double gates, labeled 'A' at the top and 'B' at the bottom. To the left of each gate set is a bypass sluice mechanism: the upper one is marked with letters C, D, and E, while the lower one is marked F, G, and H. The canal walls are depicted with a stylized interlocking masonry pattern, and the water surfaces are indicated by dense stippling. The gates are shown slightly ajar, illustrating their mechanical operation.