Anti-Hitch Kink (Mar, 1936)
Update: I forgot that I had previously posted a productized version of this: the Auto-Shocko
IF your auto is pestered by hitchers-on, here is a good cure. Fit a Ford coil with a piece of chain which will drag along the ground (but must not touch the car), and ground the other end of the coil to the car. Complete circuit as shown, and close switch for resultsâ€”Rocco Conte.