| 单词 | horizon-glass |
| 释义 | > as lemmashorizon-glass horizon-glass n. a small mirror of plate-glass fixed on the frame of a quadrant or sextant, having one half unsilvered so that the horizon-line or other object can be observed directly through it, and the reflected image of a heavenly body brought into optical coincidence with such object. ΘΚΠ the world > the universe > cosmology > science of observation > astronomical instruments > measuring altitude > [noun] > quadrant or sextant > part of quadrant or sextant quadrat?c1400 geometrical square?a1560 plummet?a1560 limb1593 line of shadows1728 limbus1738 horizon-glass1774 society > travel > travel by water > vessel, ship, or boat > equipment of vessel > navigational aids > [noun] > quadrant, sextant, etc. > part of line of shadows1728 artificial horizon1762 horizon-glass1774 sunglass1801 false horizon1812 1774 M. Mackenzie Treat. Maritim Surv. iv. 35 How to adjust the Horizon-glass for Observation, by a horizontal Line. 1820 W. Scoresby Acct. Arctic Regions I. 388 Viewed through the horizon glass of a sextant. < as lemmas |
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