IBM Slave (Secondary) Clock evolution and operation.
12:14
IBM Master Clock - Slave Clock Automatic Correction. How it works
4:50
IBM Salesman Sample Master Clock
4:35
A collection of Self Winding Clock Co. clocks
7:14
What is an Electro-mechanical clock?
3:50
Cuckoo Clock Basic Setup
6:39
Self Winding Clock Co. Slave (Secondary) Clocks. Uncommon and very interesting.
7:47
Simplex Impulse Clock Movement
7:16