单词 | dipleidoscope |
释义 | dipleidoscopen. An instrument consisting of a hollow triangular prism, with two sides silvered and one of glass, used for determining the meridian transit of a heavenly body by the coincidence of the two images formed by single and double reflexion. ΚΠ 1843 E. J. Dent (title) A Description of the Dipleidoscope. 1843 E. J. Dent Descr. of Dipleidoscope (1867) 14 The criterion for determining the position of the Dipleidoscope is, that the two images must coincide, or appear as one, when the chronometer shows, according to the equation table for 1868, 11h. 49m. 12.1s. 1851 Official Descriptive & Illustr. Catal. Great Exhib. II. 414. 1884 F. J. Britten Watch & Clockmakers' Handbk. (new ed.) 88 The advantages of the dipleidoscope over the ordinary forms of sun dials are that the passage of the sun over the meridian is indicated with greater exactness and the reflections may be discerned in weather too cloudy to see any shadow on the sun dial. This entry has not yet been fully updated (first published 1896; most recently modified version published online March 2018). < n.1843 |
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