The Ingenious and Curious Pneumatic Motions of Hero

That which passes through the diameter of the vessel will be L.M., of which a frame original: "telaro" will be made in the manner of the letter H, but let another cross-piece be placed in the upper part, such as N.O.. Through the cross-piece placed in the diameter of the vessel, and through this cross-piece of the frame, let the inner leg of the pipe pass and enter the tube inserted and soldered into the bowl. Through these, likewise, let a coclea screw R pass. Let it also be in the helix threaded part of which it is fixed into the nut original: "madre", which will be in the rule N.O. and in the L.M.. This screw, which will pass through L.M. and through N.O., should advance outside at R as much as we like. At R, let a handle be made in the manner of those of winches, with which the screw may be turned, so that the bowl at times is raised up and at times descends downward. Remembering to ensure that the inner leg of the pipe remains submerged in the water. Therefore, if we draw the air with our mouth through the outer hole, and consequently

A technical woodcut illustration of a hydraulic apparatus. It features a large ornate basin (A and B) containing an internal mechanism. A central vertical screw (R) with a handle at the top passes through a horizontal frame (N, O, L, M). This frame supports a smaller internal basin. A curved siphon tube extends from the left side of the main basin, dipping into the liquid and exiting to the left. Various components are labeled G, H, I, K, E, F, and D.

the water, the flow of it through the pipe will be equal until all the water that is in the vessel has exited. But when we want the flow to be faster, yet equal by its own nature, we will turn the screw and, by pressing the water with the bowl by virtue of the frame N.O.L.M., the exit of the water will be made faster than before, and the flow will be equal by its own nature. If we want that flow to be more forceful, turn the screw, lowering the cross-piece L.M. of the frame, and consequently the bowl. If we want it to be slower, by turning the screw in the opposite direction, we will raise the bowl. In this way, the flow through the bent pipe will be made partly equal and partly unequal. But because pulling the water with our mouth does not succeed in large conduits, as it happens in small ones when wanting to draw water through large channels, we will do as in the following Theorem, where what has been said above is clearly understood in the figure described below.