Synchronome component, what is it?


Hi, I hope you are all well and not suffering too badly in these trying times. This is my first post here, I am wanting to know what this part is on my early Synchronome and what does it do? I have the movement running quite well now using two back to back diodes for spark quench (Thanks Rod Elliott) and it is now time to attach the clocks slave movement so I need to know what this does? So do I need it?
Cheers from Australia.
Graeme Power

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