| 单词 | index-glass |
| 释义 | > as lemmasindex-glass index-glass n. a mirror at the fixed point of the index-arm in an astronomical or surveying instrument, from which the light is reflected to the horizon-glass. ΘΚΠ the world > physical sensation > sight and vision > optical instruments > mirror > [noun] > other mirrors perspective glass1570 side mirror1769 index-glass1773 Claude Lorraine glass1792 anamorphoscopea1884 magnetic mirror1884 ox-eye1890 busybody1892 rear mirror1896 triple mirror1907 three-way mirror1964 two-way mirror1967 1773 Gentleman's Mag. 43 390 The index-glass being bent by the brass frame that contains it. 1828 Moore's Pract. Navigator (ed. 20) 152 If the arch seen direct, together with its reflected image, appear to be in one line, the Index-glass is truly adjusted. < as lemmas |
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