Theater of Machines, Vol. 6

screws; it has only one hole at the bottom, through which the water runs in. And this cover, together with the pump F, is entirely rigid and immobile. Now, when the water goes into the hole or opening, it is driven out by the wheel—as one sees in the cover, marked with S—and with the help of the board D. This board retains the water so that it must go into the pump, while it moves up and down through the movement of the aforementioned wheel, between two columns which hold the wheel up with the help of the four rollers they have on both sides, as can be seen on the two marked A and D. Now that the water is retained by the board and driven forward by the wheel, it must have its exit with force through the pump F, and thus runs into the channel marked with E, as one can best see from the figure provided.