Another eddy current effect is to put a small DC voltage on a 120 VAC shaded
pole motor. The rotor will sort of ooze around when you turn it by hand. I made
a great payout reel drag by using one of these driven by a swing arm
potentiometer controlling an LM317 voltage regulator. Very non-critical, but
worked much better than a friction brake.

Earle Rich
Mont Vernon, NH