…When one of the disks is rotated, air is released from the holes only when the small holes in the other disks are aligned, and this intermittent air flow produces a fundamental tone whose frequency is the product of the number of holes and the number of rotations of the disks. It was invented in 1819 by French physicist Charles Cagniard de la Tour (1777-1859). It can produce a louder sound than an ordinary speaker, so it is used as a powerful sound source in signal and warning devices. … From [Critical state]...The state of matter at this temperature and pressure (or, more broadly, the state near it) is the critical state, and the point at which the critical state occurs is called the critical point. The critical state itself is said to have been discovered in 1822 by Charles Cagniard de la Tour (1777-1859) of France, but its meaning was not made clear until the method of artificial pressurized liquefaction was established. The method of pressurized liquefaction was discovered by the efforts of M. Faraday and others in the early 19th century, and chlorine, carbon dioxide, hydrogen sulfide, cyanide gas, ammonia, and other substances were liquefied one after another. ... *Some of the terminology that mentions "Cagnard de la Tour, C." is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…円板の1枚を回転させると,2枚の板の小穴が合ったときだけに穴から空気が噴出し,この断続的な空気流によって,穴数と円板の回転数とを掛けた周波数を基本音とした音が発生する。1819年,フランスの物理学者カニャール・ド・ラ・トゥールCharles Cagniard de la Tour(1777‐1859)によって発明された。ふつうのスピーカーに比較して大きな音を発生させることができるので,強力音源として信号や警報用の装置に利用されている。… 【臨界状態】より…この温度,圧力における物質の状態(あるいは,より広い意味ではその付近の状態)が臨界状態であり,臨界状態が生ずる点を臨界点と呼ぶ。 臨界状態そのものは,1822年にフランスのカニャール・ド・ラ・トゥールCharles Cagniard de la Tour(1777‐1859)が発見したことになっているが,その意味が明らかになったのは,人工的な加圧液化の方法が確立された後である。加圧液化の方法は,19世紀の初めころ,M.ファラデーらの努力によって発見され,塩素,炭酸ガス,硫化水素,シアンガス,アンモニアなどが次々に液化された。… ※「カニャール・ド・ラ・トゥール,C.」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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