[Copper gold-plated comprehensive ruler]
Copper gold-plated comprehensive ruler, made by the Qing Palace Building Office, was 15.3 cm long, 4.9 cm wide and 0.2 cm thick during the Kangxi period of the Qing Dynasty. The old collection of the Qing Palace
This comprehensive ruler is a tool that can be drawn and measured. Its one side is divided into upper and lower scales, the upper side is a micrometer, and the lower side is engraved with the name and scale of the trigonometric function. The other side is surrounded by protractors. In the middle is a scale, which can expand or reduce the length of the line segment
This rule is very useful for drawing calculation.
![图片[1]-Copper gold-plated comprehensive rule-China Archive](https://chinaarchive.net/Qing dynasty/Clockwork instrument/23782[1024].jpg)
![图片[2]-Copper gold-plated comprehensive rule-China Archive](https://chinaarchive.net/Qing dynasty/Clockwork instrument/23783[1024].jpg "铜镀金综合算尺另面")
铜镀金综合算尺另面
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