ON FORTIFICATION.

But to demonstrate the arrangement of these gates when open, I mark it with this 8th Figure.

8th Form.

A technical architectural diagram shows the plan view of a sluice or lock gate system within a masonry channel. The channel walls are depicted with a brick or stone pattern and features several notches or recesses. The diagram is labeled with several letters: 'H' at the top/exterior opening, 'I' at the bottom/interior opening. Two long gates, labeled 'B' on both sides, are shown folded back into recesses in the side walls. Hinges or pivot points are marked 'D' and 'F' at the top, and 'A' and 'C' near the bottom. Points on the outer edges of the gate structure are marked 'E' and 'G'.

The aforementioned method of Adrien Janssen was afterwards improved by Adrien Diricxen, a carpenter in Delft, and applied to two pointed gatesoriginal: "portes poinctues"; also known as miter gates, these are two gate leaves that meet at an angle pointing upstream to create a tight seal under water pressure., as described previously in the 5th Figure, for which he obtained a patentoriginal: "octroy"; an exclusive right or monopoly granted by a governing body, similar to a modern patent. from the Most Mighty Lords the States The States General, the governing body of the United Provinces of the Netherlands., to be the only one permitted to construct them: According to this method, two sluicesoriginal: "Escluses"; here referring to the entire lock or gate structure used to control water flow. are placed at Maassluis original: "Maselantfluys", and another at Hellevoetsluis original: "Hellevoctfluys".

But according to the method of the 7th Figure, one has been built at Vlaardingen, another at Schiedam, and a third at Bergues original: "Winnoxbergen"; specifically Bergues-Saint-Winnoc in French Flanders. in Flanders.

But if it were a question of which of these two methods is the best, and I were to give my opinion, it would be that the gates of the 5th Figure please me more than the others: Firstly, because each of the four gates of the 7th Figure,