| 摘要 |
A transit includes two identical transit elements oriented at 90 DEG with respect to each other. Each transit element includes an objective end and a viewing end and be focused on a distant point. The transit is mounted on top of an intersection of two elements, and the elements can be moved to be at a right angle with respect to each other. Once the right angle is set, other portions of a polygonaly figure, such as a rectangle or a square, can be set.
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