The Book of Ingenious Devices: (Kitāb al-Ḥiyal) by Banū (auth.)

By Banū (auth.)

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Additional resources for The Book of Ingenious Devices: (Kitāb al-Ḥiyal)

Sample text

Of the tank]. l, bent downwards, and to end (t) we fix aground valve'lbat opens towards the inside oftank (ew) - its opening is [therefore] upwards. Inside pipe (zl) wc place /loat (y) on which we erect a rod that rises above the top ofpipe (zl), and we bend it down to valve and solder it to its plug. e. e. Model I]: the inside [pipe] is marked (lk) and the outside (mn). End (k) ofpipe (kl) protrudes from tank (ew) and discharges into a small tank (sx), in the bottom ofwhich is a small hale at (x).

A jar (jarra) with two diametrieaHy opposed taps: liquid will only diseharge from the tap that is opened first. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33. 34. 35. 36. 37. 38. Page 78 80 82 84 86 88 90 92 94 95 96 98 99 100 102 104 106 108 110 113 oI Modeis 41 Model Description Page 39. Ajar (jarra) with a tap: it is first filled with wine, but watcr discharges, not wine, as long as the water is poured into the top of the jar. A jar (jarra). Action as in Model 39. A jar (jarra) with an outlet pipe, from which wine discharges when inpouring of wine is stopped; when water is then poured in continuously, it discharges in place of the wine.

A eolumn of liquid therefore remained in the cap, almost up to point (b). L~I-----CI d In Arabic this siphon is called ka 's al-'adl which can be translated approximately as the Cup of Equivalence. The word 'adi contains the concepts of equality, balance andjustice and the expression therefore implies that the purpose of the siphon is to produee a balanee of pressures. This idea is more readily explicable when considering the double concentric siphon (see 2). The ordinary bent tube siphon is used by the Banii Miisa, but the eoneentric siphon is mueh commoner.

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