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Water organ
The water organ or hydraulic organ ((ギリシア語:ὕδραυλις)) (early types are sometimes called hydraulis, hydraulos, hydraulus or hydraula) is a type of pipe organ blown by air, where the power source pushing the air is derived by water from a natural source (e.g. by a waterfall) or by a manual pump. Consequently, the water organ lacks a bellows, blower, or compressor.
On the water organ, since the 15th century, the water is also used as a source of power to drive a mechanism similar to that of the Barrel organ, which has a pinned barrel that contains a specific song to be played. The hydraulis in ancient Greek is often imagined as an automatic organ, but there is no source evidence for it. One of the oldest automatic instruments known is the automatic flute player invented by Banū Mūsā brothers in 9th-century Arabia.
==Hydraulis==
A hydraulis is an early type of pipe organ that operated by converting the dynamic energy of water () into air pressure to drive the pipes (). Hence its name hydraulis, literally "water (driven) pipe (instrument)." It is attributed to the Hellenistic scientist Ctesibius of Alexandria, an engineer of the 3rd century BC. See more about the Hydraulis and its further development in pipe organ. The hydraulis was the world's first keyboard instrument and was, in fact, the predecessor of the modern church organ. Unlike the instrument of the Renaissance period, which is the main subject of the article on the pipe organ, the ancient hydraulis was played by hand, not automatically by the water-flow; the keys were balanced and could be played with a light touch, as is clear from the reference in a Latin poem by Claudian (late 4th century), who uses this very phrase (''magna levi detrudens murmura tactu . . . intonet'', “let him thunder forth as he presses out mighty roarings with a light touch”) (''Paneg. Manlio Theodoro,'' 320–22). See organ (music) for more details and external links.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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