| 单词 | Beaman stadia arc |
| 释义 | Beaman stadia arc [`bē·mǝn `stād·ē·ǝ ´ärk] ENGINEERING An attachment to an alidade consisting of a stadia arc on the outer edge of the visual vertical arc; enables the observer to determine the difference in elevation of the instrument and stadia rod without employing vertical angles. |
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