In this paper, an experiment of test scale of straightedge is introduced by theprinciple of the Moire fringe shift amplifier.
2
划线规的脚为等宽、等厚的两直条脚，并刻有等分刻度及直尺刻度。
The feet of the marking device are two aequilate and isopachous straight stripe feet, and the evenly divided scale and the ruler scale are engraved on the feet.
3
两个卡边上都有刻度并垂直于直尺。
Both the clamping edges are provided with scales and are perpendicular to the ruler.
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