= optical square n. at optical, adj. n.compounds.
| 单词 | θ7419 |
| 释义 | the world > the earth > earth sciences > geography > map-making > surveying > [noun] > surveying instruments > for laying off lines at right angles (2) optic square1809 = optical square n. at optical, adj. n.compounds. optical square1853 an instrument used to establish lines of sight at right angles to each other by using light bent through a right angle by mirrors or a prism. |
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