| 单词 | crossbar micrometer |
| 释义 | crossbar micrometer [`krȯs´bär mī`kräm·ǝd·ǝr] ENGINEERING An instrument consisting of two bars mounted perpendicular to each other in the focal plane of a telescope, and inclined to the east-west path of stars by 45°; used to measure differences in right ascension and declination of celestial objects. |
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