| 单词 | ramsden's ghost |
| 释义 | > as lemmasRamsden's ghost Ramsden's ghost n. now historical and rare an apparatus consisting of one or more convex lenses which projects the image of a contrasting object onto a plumb line, or projects the image of the plumb line onto a wire, in order to align a telescope which is mounted in a transit circle, mural circle, quadrant, or sector; (also) the image produced by this apparatus.extracted from Ramsdenn.< as lemmas |
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