PaulMmn
Senior Member
- Location
- Union, KY, USA
- Occupation
- EIT - Engineer in Training, Lafayette College
That reminds me of the time in college when before a physics lecture started someone had taken the clock in the back down and managed to get it running backwards. The professor got very confused as he took glances at the clock to see how things were progressing (or not). Then after a few chuckles from the students he realized he'd been had.
It was an old clock so it probably had a synchronous motor with a shaded pole, and it was susceptible to getting reversed as Jraef mentioned.
Good call by Jraef on the OP's puzzling conundrum. :thumbsup:
We used to have one like that-- you spun a little knob poking out the back. If you spun it the other way, the clock ran backwards. The other end of the knob was a wheel about 1" across. It wasn't a gear; it had notches all around the edge. It rested between 2 poles of the motor. The clock didn't have a case, so you could see the workings! Great fun playing for an inquisitive youngster.
