Lay out plate, sheet steel or other heavy metal and mark bending and cutting lines on work piece using protractors, compasses and drawing instruments or templates.
铺设莱板，钢板或其他重金属，用量角器，圆规和绘图工具或模板在工件上标记弯曲和切割线。
The utility model is characterized in that an elliptic auxiliary part for drawing ellipses is connected to the compasses on the basis of the original compasses.
其特点是在原有圆规上又连接有一个画椭圆的椭圆辅件。
It can not only be used in drawing graphics like compasses and rulers, but also can reach dynamic effect which compasses and rulers can't do.
它既可以像使用圆规，直尺一样的用于作图，同时它有可以达到圆规、直尺不能达到的动态效果。
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。
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。
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