Master clock

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A master clock is a precision clock that provides electrical pulses to synchronize slave clocks. Master/slave clock systems were used in the days before quartz clocks as a means of keeping all the clocks in a building or workplace synchronized. They were also used to provide time pulses for other devices such as noon sirens etc.

In the UK they were especially used by the GPO (Post Office) to provide timing pulses for telephone exchanges.

In the UK there were three main manufactures they were Gents, Magneta and Synchronome.


Master Clock 36A
Master Clock 36A
Closer view of a clock 36 mark 6 manufactured by Gents of leicester
Closer view of a clock 36 mark 6 manufactured by Gents of leicester
Master Clock driving several slave clocks. Note third one along at the top from the right is a radio controlled quartz for reference
Master Clock driving several slave clocks. Note third one along at the top from the right is a radio controlled quartz for reference



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