A (pair of) drawing compass(es). The rotation point of the legs are set at the screw points so resizing them should be very easy with Inkscape 绘图 技术 体系结构 绘制中的罗盘
A (pair of) drawing compass(es). Similar to the other in my collection except this one includes the adjusting wheel. 学校 教育 绘图 指南针 2
Remember back to the days of the 80s when these were banned in school and were confiscated on a regular basis. No scientific stuff here, just a plain and simple old fashioned calculator with a seven segment display 学校 复古 数学 旧的计算器
The same as my other blue ruler, however in the first one the numbers are left as fonts, but in this one they are converted to curves. 绘图 测量 学校 蓝色标尺 2