k, Protractor muscle of the foot.
If you have difficulty with this step, you can use a protractor to lightly mark three 60-degree sections.
If then the balls are both charged to a potential V they will repel each other, and the threads will stand out at an angle 20, which can be observed on a protractor.
using a protractor, draw a line for the back azimuth on the map from the known position back toward your unknown position.
place a protractor behind it so that the pin (P) passes over the scale on the protractor.