Analogue flip wall clock
The movement of the flip clock.
The gear train (white plastic gears) drives the two main axles shown in the photo. The hour axle rotates once in 24 hours and the minute axle once in an hour. The solenoid (the metal bar with copper wire tightly wrapped around it) generates a magnetic field when current is passed through it. The direction of the current is then alternated causing the the magnetic field to keep changing direction, which causes a small magnetised wheel in the clock to rotate - which drives the gear train.
Damaged pivot gear
The clock had stopped running and on close examination of the above photo you can see why. The pivot gear has split and can no longer drive the next gear in the gear train.
PS This clock belongs to Rob at http://www.eye-wear-glasses.com/