ON FORTIFICATION

...it was free from the rebateoriginal: "feuilliere"; the recessed groove or notch in the wooden frame that holds the gate leaf in place against water pressure., which was about 3 fingers’ widthoriginal: "doigts"; an informal unit of measurement approximately equal to 3/4 of an inch or 2 centimeters.; for then it would turn by itself, emptying the water.

And because at that time (as is also the case now) there was much discussion among the Master Carpenters about deepening the harbors and making them passable for ships with upright masts, it happened that as I was discussing this matter with Adrien Ianssen, Master Carpenter of the City of Rotterdam, and with Cornelis Diricxsen Muys, Master Carpenter of the City of Delft, each of us three claimed to have imagined something he estimated to be good. We agreed among ourselves that each would declare his invention, on the condition that whether profit or loss should follow, we would share it equally and help one another. The invention of Adrien Ianssen was that instead of hoisting the gate out of the rebate as at the aforementioned Sluice of Brielleoriginal: "Escluse de la Briele"; referring to the Dutch port town of Brielle., he applied a barrier gate as mentioned above (but not placed in a swinging frame) with some other changes that he added to it.

My invention consisted of two pointed gatesoriginal: "portes poinctues"; these are miter gates that meet at an angle pointing upstream, a design that uses water pressure to keep the seal tight., such that each gate could be hoisted upwards in the common manner, as the following 6th Figure demonstrates; for through it, large ships with upright masts could pass, and it would furthermore serve to deepen the harbors.

A technical engineering diagram illustrates a wooden lock or sluice gate mechanism. It features a heavy timber frame supporting two pointed gates in the center. These gates are attached to a system of ropes and horizontal winding rollers (winches) mounted atop the frame, designed to lift the gates vertically. The drawing provides a detailed view of the structural assembly, including the joinery, bolts, and an isometric perspective of the massive woodwork required for harbor management.