| 单词 | cassegrain |
| 释义 | > as lemmasCassegrain Applied to a modification of the Gregorian reflecting telescope suggested in 1672 by M. Cassegrain. Also Cassegrain, used attributively and absol. ΘΚΠ the world > physical sensation > sight and vision > optical instruments > instrument for distant vision > [adjective] > telescope > reflecting telescope specular1651 Newtonian1737 Gregorian1762 Herschelian1792 Cassegrainian1813 the world > physical sensation > sight and vision > optical instruments > instrument for distant vision > [noun] > telescope > reflecting telescopes reflecting telescope1672 reflector1735 speculum1789 Herschelian telescope1792 Newtonian1820 reflector telescope1840 Cassegrain1888 Nasmyth1960 Nasmyth–Cassegrain1972 1813 H. Kater in Philos. Trans. (Royal Soc.) 103 (title) On the light of the Cassegrainian Telescope, compared with that of the Gregorian. 1831 D. Brewster Treat. Optics xlii. 352 The Cassegrainian telescope..differs from the Gregorian only in having its small speculum..convex instead of concave. 1888 Encycl. Brit. XXIII. 145/1 The Cassegrain telescope... In comparatively recent years the Cassegrain has acquired importance from the fact of its adoption for the great Melbourne telescope. 1961 Listener 7 Sept. 353/3 The Cassegrain mirror is swung down into a compartment let into the telescope tube. < as lemmas |
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