| 释义 |
† dietheroscope Obs.|daɪiːˈθɛrəskəʊp|
[ad. It. dieteroscopio (G. Luvini 1874, in Atti d. R. Accad. d. Scienze Torino 1873–74 IX. 389), f. Gr. δι- di-2 + αἰθήρ ether + -o + -scope.]
An instrument for measuring variations in atmospheric refraction, usually consisting of a telescope having additional lenses or mirrors which bring two images of any object into the field of vision.
1877Q. Jrnl. Meteorol. Soc. III. 414 The dietheroscope serves to show every little change of position, apparent or real, of any distant object. Its principal application is the measurement of the variations of atmospheric refraction. 1889Times 21 Mar. 3/3 There are also Luvini's dietheroscope for observing the changes of atmospheric refraction optically; [etc.]. |