The Ingenious and Curious Pneumatic Motions of Hero

while immersing the ball in water, because the air enclosed in that part of the ball whose tube is stopped cannot exit, and it will only enter into the other, from which the air can exit through the open tube, and give place to the air. And after said part is filled with hot water, close its vent in the neck, and remove it from the vessel of hot water. Then uncover the other, and having placed the ball in cold water, let it be filled similarly. Then, having stopped the other hole, remove it from the water, and the ball will be full. And wanting to send out the hot water, uncover the vent or tube of that part of the ball in which it is enclosed, and it will exit through the holes in the bottom part of said ball. And when we no longer want it to exit, we will stop that tube again. We will do the same for the part where the cold water is. And wanting to send out both at once, open one vent and the other, and close them when we no longer want it to exit. And it is to be noted that these vents can be reduced into a single tube divided into two parts, and in the top of it, one can make a single hole arranged in such a manner that by closing and opening these holes at our pleasure, it appears that everything comes from one and the same hole through that neck, as the example below demonstrates.

ON THE VESSEL CALLED PROCHITA, WHICH IN SACRED

An ornate, classical-style vessel (Prochita) featuring a decorative handle shaped like a human figure pouring from a small jug. The body of the vessel is decorated with a face in relief. A technical diagram is overlaid showing internal components: a horizontal diaphragm (C.D.) with perforations like a sieve, and a central tube (E.G.H.) extending towards the bottom. Labels A, B, C, D, E, G, H, and K mark the mechanism.

Vessels are still manufactured that, when filled with wine and water, sometimes give pure water, sometimes send out pure wine, and sometimes water and wine mixed together. Their fabrication is done in this way. Let there be the vessel A.B., in the middle of which the diaphragm is placed, that is, the partition or diameter C.D., and around the body of the vessel, this diameter is pierced with thick holes in the manner of a sieve or criuello sieve, as we call it. And in the middle of this diameter, let there be a round hole, through which the perforated pipe E.G.H. passes, well joined and soldered at E., and with the mouth G. a little distance from the bottom of said vessel. The other mouth at H. should be soldered very well to the vessel, and a small aperture made in it that enters into the mouth of said pipe at H. on the ear of the handle, which will be made as the figure demonstrates, and like the pipe perforated. And on the turn of it at K., let another aperture or vent be made.