1920s Radial Planimeter Review / HowTo

A K+E Radial Planimeter, from 1920s. It measures the average radius of a roughly circular shape! This is episode 76 of my video series about old calculating devices. Radial planimeter instructions: https://archive.org/details/radialins... End song inspired by "Hotter than a Molotov" by The Coup. Chris Staecker webarea: https://faculty.fairfield.edu/cstaecker #planimetria