Here is a plot of a human's trajectory on a circular curved slide, and you can see how fast they go with a high (0.6) or low (0.1) coefficient of friction. (Remember, that's the Greek letter “mu ...

This white plastic circular rule has a clear plastic indicator attached with a metal grommet in the center. The rule has scales of H (horizontal factor), theta (vertical angle), and V (vertical factor ...

This yellow aluminum circular slide rule has three clear plastic indicators, one blank. The other indicator on the front is marked in red to denote the C, CI, A, A F, L, F A, LL2, LL1, DS, DT, and M ...