一、尺子的结构和刻划复式视距尺(图1)为利用复式比例尺原理来提高视距精度的视距尺。由主尺和副尺两部分构成。主尺和普通视距尺基本一样,但只有分米刻划,供读取视距的10米整倍数用。主尺顶部的方形觇牌即副尺,供读取视距的零米数用。照准主、副尺均用分中法。 First, the ruler’s structure and characterization of the complex sight distance ruler (Figure 1) is a line-of-sight ruler that uses the principle of multi-scale scale to improve the line-of-sight accuracy. It consists of two parts: the main ruler and the delineator. The main ruler and the basic line-of-sight ruler are basically the same, but only the decimeter is used to read the 10-millimeter multiple of the line-of-sight. The square card at the top of the main ruler is the second ruler, which is used to read zero meters of line-of-sight. Both the main and the secondary rulers are divided into Chinese.