Science Fact Friday: Homology

I’ve also found this a helpful art tool. Whenever you forget which way a particular joint bends you can just reference your own!

Benjamin Franklin - Magic Circle, “Experiments and Observations on Electricity”, 1750.

Each radius of this Magic Circle (including the center entry) sums to 360, as does each annulus. Franklin has also highlighted 20 “excentric” annuli, each of which, together with the central 12, sums to 360.