... 半圆转移：half dégagement 划圆；重复转移：double dégagement; dedouble 划圆[加倍]转移：double; doubler-dedoubler ...
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划圆是通过直径片的端点沿圆周轨迹转动，其圆心的位置是固定的原理而实现的。
The end of diameter plate moves along the circumference trace and its circle center is fixed.
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。
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.
用低倍系统瞄准目标时，分划形式见图4，分划形式是三个同心圆的分划。
When using low power system aims at target, the graduation form is as shown in Fig. 4, it is the graduation of three concentric circles.
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