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The pneumatics of Hero of Alexandria

Chapter 68: 64. A Drinking-Horn from which a Mixture of Wine and Water, or pure Water may be made to flow alternately or together, at pleasure.
By of Alexandria Hero
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About This Book

A systematic practical handbook of machines and demonstrations that uses air, steam, heat, and water to produce mechanical effects. The text gives clear descriptions, construction details, and diagrams for siphons, valves, pumps, fountains, jets, self‑acting mechanisms, and ritual or theatrical contrivances driven by pressure and temperature changes. Explanations focus on the mechanical principles behind pneumatic and hydraulic behaviors and on ways to control flow and timing, with numbered propositions that pair instructional steps with illustrative figures for building and operating each apparatus.

64. A Drinking-Horn from which a Mixture of Wine and Water, or pure Water may be made to flow alternately or together, at pleasure.

The construction of a drinking-horn from which at first a mixture shall flow; when we please, on pouring in water, water alone, and then again a mixture. Let A B (fig. 64), be a drinking-horn, its neck closed by the plate C D, through which is inserted a tube, E F, leading to the orifice F, and having a hole, G, bored in it within the vessel: in the vessel just under the partition make a vent H. Now, if we close the orifice F and pour in the mixture, it will pass into the body of the vessel through the hole G; and if we set F free, the mixture will flow through it, the air entering by the vent H. Again, if we close H and pour in pure water, the mixture will no longer flow as the air has no means of entrance, but pure water; and, when H is set free, both will flow, the water and the mixture, or rather a mixture which is produced from the two united.