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We should draw many long lines when plotting, and in this process,we use some rulers,triangles,tapes and a series of tools to meet the needs of plotting lines,various tools may lead to its lower efficiency, so our team has designed the rotatable ruler which extends unboundedly in the horizontal and vertical direction,and it improves the efficiency of plotting lines greatly.
Xiangtan University
Xiangtan, China
Chen Xingxu,
Xiangtan University
Luo jian,
Xiangtan University
Xiangtan University
Xiangtan, China
ChenXingxu ChenXingxu,
Xiangtan University