A square with two graduated sides marked on the right-angled corner of a quadrant (quadrant, n.1 7) to facilitate its use. Obsolete.
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| 单词 | θ1419 |
| 释义 | the world > the universe > cosmology > science of observation > astronomical instruments > measuring altitude > [noun] > quadrant or sextant > part of quadrant or sextant (7) quadrat?c1400 A square with two graduated sides marked on the right-angled corner of a quadrant (quadrant, n.1 7) to facilitate its use. Obsolete. geometrical square?a1560 geometrical square: see quadrat, n. 1b. Obsolete. plummet?a1560 A ball of heavy metal attached by a line to a quadrant or other scientific instrument. limb1593 In scientific use; The edge or boundary of a surface. The graduated edge of a quadrant or similar instrument. line of shadows1728 Optics, etc. †right shadow: the figure thrown by an opaque body upon a horizontal plane to which it is perpendicular. †contrary shadow, †versed shadow… limbus1738 Used technically in lit. sense of ‘border’ or ‘edge’; e.g. the ridge which borders the crater of a volcano; in Historical use, the rim of a crater… horizon-glass1774 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… |
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