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 drawing technical architecture Drawing Compass
A (pair of) drawing compass(es). Similar to the other in my collection except this one includes the adjusting wheel. school education drawing Compass 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 school retro math Old Calculator
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. drawing measuring school Blue Ruler 2