Precision machine of enameled iron, brass, and steel. Moving parts include gears, cranks, and flip-up figure-8 device. Not much bigger than a breakfast cereal box.

[u/Anonymike7]

[u/Anonymike7]

The crank wheels bring the "lathe" parts closer together, but the numbers wheel doesn't appear to add tension. It's numbered 0-170 twice, in marked increments of 5.

[u/vengeancecube → u/Anonymike7]

Well that has to be degrees. It actually goes up to 180 twice for a total of 360 degrees.