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The pneumatics of Hero of Alexandria

26. A Vessel from which Wine flows in proportion as Water is poured into another.

Joseph George Greenwood translation

Diagram of apparatus as described in text
Diagram of apparatus as described in text
Stylized I
Stylized I

If it is required that the wine shall flow in a certain ratio to the water we pour into the vessel, we must proceed as follows. As before let A B (fig. 26) be the vessel containing water, and G H that which contains wine, but let the tube E F be outside the vessel A B. In A B let a ball, D, float, from which a cord, passing over a pulley, S, is attached to the tube E F so as to suspend it; and let all else correspond with what was stated in the last paragraph. The result will be that, when water is poured into the vessel A B, the ball D rising will lower the tube E F, and the wine will flow again. This may be effected in a different manner by attaching the cord from the ball D, across the pulley S to another pulley, T and across that again to the siphon K L. It will be found now that, when the ball rises, the siphon K L M, being suspended by the cord, is lowered, so that, the outer leg having again become the longer, the wine will flow through the mouth M.

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