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The Round Ruler / ruler

The Round Ruler

The Round Ruler
The ruler often be used,but it isn't convenient to measure cylinder.So on the basis of ordinary ruler,add a cambered surface to calculate different size of cylinder.With subtle radian,the Round Ruler not only can be fixed in the measurement process,but also be convenient and accurate to measure scale.


Zhengzhou University of Light

Zhengzhou University of Light
Zhengzhou City, China

Li Xue-Qiong,
Zhengzhou University of Light Industry