![]() Step 7: Measure off however many even increments you want along the string. Step 6: Cut off exactly one lap of the string. Step 5: Wrap the string around the cylinder (in the groove). Step 4: Make a fine groove in the cylinder, of even depth and non-wavering axial elevation. Step 3: Make a cylinder out of the machinable material (perhaps using a lathe). Find a string material that is reasonably non-stretchy. Step 1: Find a machinable material that is reasonably incompressible. Given the imprecision involved in using mechanical construction tools (how thick is the tip of your pencil? how smoothly can you draw an arc with a compass? how 'straight' is your straightedge?), and the inherent limits involved in reading or using a protractor (can you even measure a degree to less than 0.1 degree precision with a protractor anyway?), this would seem to be good enough for almost all conceivable purposes. The resulting angles $\angle AOC, \angle COD, \angle DOB$ are not exactly 1 degree each, but the difference between the actual measures and the desired measures are less than 1 part in 10,000.
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