| 单词 |
polemoscope |
| 释义 |
polemoscope|pəʊˈlɛməskəʊp, ˈpɒlɪməʊ-|
[ad. mod.L. polemoscopium (Hevelius a 1668), f. Gr. πόλεµο-ς war: see -scope. So F. polémoscope.]
A telescope or perspective glass fitted with a mirror set at an angle to the line of vision, for viewing objects not directly before the eye. (So called from its proposed use in war.)
1668Phil. Trans. III. 729 Some years ago I was framing one of Hevelius's Polemoscopes. 1727–41Chambers Cycl. s.v., Any telescope will be a polemoscope, if the tube be but crooked, like a rectangular syphon..and between the object glass..and first eye-glass..be placed a plain mirror. 1842Brande Dict. Sc., etc., s.v., Hevelius chose the name of polemoscope, because he thought the instrument might be applied, in time of war, to discover what was going on in the camp of the enemy, while the spectator remained concealed behind a wall or other defence.
b. (See quot.)
1884Knight Dict. Mech. Suppl., Polemoscope, a reflecting apparatus consisting of two plane mirrors so inclined as to enable the spectator, by glancing into one of them, to see the images of objects separated from direct view by intervening obstacles. |
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