| 单词 |
cœlostat |
| 释义 |
cœlostat Astr.|ˈsiːləʊˌstæt|
[f. cœlo-2 + -stat.]
An instrument consisting of a mirror turned by clockwork on an axis parallel to itself and to the axis of the earth, by means of which the celestial bodies may be observed and photographed as in a stationary position.
1898Standard 24 Jan. 4/5 The present phenomenon [sc. the total solar eclipse of January 22, 1898] will be remembered as the first in which the instrument called the cœlostat was used. 1900H. H. Turner in Monthly Rev. Sept. 108 A special arrangement..called a ‘cœlostat’, which reduces the whole sky virtually to rest in a most convenient manner. It was invented long ago by a Frenchman, but practically forgotten. 1939Jrnl. Brit. Interplan. Soc. V. 9 The cylindrical objects shown just above the catwalk..are coelostats. These are synchronised, motor-driven mirror devices something similar to a stroboscope, and it is by means of these that a stationary view of the heavens is provided for navigational observations while the ship is in rotation. 1961Guardian 13 Feb. 16/3 A coelostat lent by the Mill Hill Observatory..produces a static image of the sun. |
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