An instrument consisting of a sextant fitted with two reflectors, used for measuring the distance of an object from the observer.
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| 单词 | θ64878 |
| 释义 | the world > physical sensation > sight and vision > optical instruments > instruments for measuring > [noun] > distant objects (1) macrometer1825 An instrument consisting of a sextant fitted with two reflectors, used for measuring the distance of an object from the observer. |
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