| 单词 | crookes's radiometer |
| 释义 | > as lemmasCrookes's radiometer a. An instrument comprising four lightweight metal vanes, black on one side and white on the other, mounted on a spindle inside a partially evacuated glass bulb, so that the vanes rotate when illuminated with sunlight. Also Crookes radiometer, Crookes's radiometer.Invented by Sir William Crookes to illustrate the transformation of radiant energy into mechanical energy, but now chiefly used for amusement. It has also been used to measure the intensity of sound by means of its radiation pressure. ΘΚΠ the world > matter > physics > electromagnetic radiation > [noun] > instrument for measuring radiometer1875 spectroradiometer1923 planchet1947 the world > matter > physics > energy or power of doing work > [noun] > change from one to another > instrument illustrating radiometer1875 the world > matter > physics > mechanics > dynamics > thermodynamics > [noun] > instrument illustrating principle radiometer1875 Crookes radiometer1884 the world > matter > physics > science of sound > [noun] > instrument measuring intensity radiometer1905 Rayleigh disc1913 sound meter1928 1875 W. Crookes in Proc. Royal Soc. 23 377 The luminous rays..repel the black surface more energetically than they do the white surface. Taking advantage of this fact, the author has constructed an instrument which he calls a radiometer. 1885 Encycl. Brit. XIX. 249/1 In Crookes's radiometer the free path is very long. 1893 R. S. Ball Story of Sun 256 Highly rarefied gas like that contained in one of Mr. Crookes's radiometers. 1905 R. W. Wood in Physical Rev. 20 113 It occurred to me that a mill-wheel or radiometer driven by these [sound] waves would be useful for purposes of demonstration in treating of radiation pressure. 1930 R. H. Baker Astron. x. 396 Abbot,..working with the 100-inch reflector, made use of delicate radiometers, having vanes of blackened bits of fly-wings, to measure the energy in different parts of the spectrum. 1966 McGraw-Hill Encycl. Sci. & Technol. (rev. ed.) XI. 317/2 The Crookes radiometer survives in jewelers' windows as a ‘perpetual motion’ device. 2001 Brit. Jrnl. Hist. Sci. 34 73 His [sc. Crookes's] trials of different designs resulted in the ‘radiometer’ or ‘light mill’ for the measurement of radiation. < as lemmas |
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