Now, use your compasses to measure the attitude of the two limbs of the anticline.
现在用你们的罗盘去测量一下那个背斜两翼的产状。
Said diameter plate composed of two pieces is installed in the slot on inner side of compasses' disk. The slide valve and turning handle are on the diameter plate for drawing circle precisely.
圆规盘内侧壁设计了直径片转动槽，直径片分两片组装进入转动槽，直径片上设计有滑动阀与转动柄，从而达到精确划圆的目的。
The protractor (3) with a triangular rule is arranged on a board and is fixed on the two sides on the upper part of the compasses through an elastic fixing clip (7).
板面上带有三角尺的量角器(3)通过弹性固定卡(7)固定在圆规的上部两侧。
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