通过对汉代的内向连弧纹镜的研究后发现,这种纹饰是古人用圆规分出的等分。进而对四神博局镜的背纹进行研究后发现,四神博局镜背纹中的几何纹饰也全部是采用圆规及直尺经过精心绘制而成。直至今日还可以看到,四神博局镜背纹中的几何纹饰,大都在某两条线的相交点上。从而说明,汉代的先民已具有了一定的机械制图水平。 Through the study of inward inward arc mirror in the Han Dynasty, it was found that this ornamentation is an ancients divided by the ancients. And then the four god Bo Department of mirror mirror back study found that the four god Bo Department mirror back in the geometric patterns are all decorated with compasses and straightedges carefully drawn. As of today, you can still see the geometry decoration of the Mirror in the SOGO mirror, mostly at the intersection of two lines. Thus, the ancestors of the Han Dynasty already have a certain level of mechanical mapping.