Electronic master clock

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Electronic master clock
Manufacturer	(unknown)
Production years	(unknown)
Production location	(unknown)

This pioneer application of a quartz-controlled clock acting as a master and driving a set of slave dials. One such dial is mounted above the clock.

[edit] How it works

The clock is powered by a nickel-cadmium battery which is kept charged by the mains. Its output consists of impulses lasting for one second, delivered every minute. The maximum current is 1A and this is sufficient to drive up to 125 slave dials. Push-button controls enable the slaves to be stopped or accelerated and then synchronized exactly to a time signal. A unique feature of the system is an ‘electronic memory’ which comes into operation if there is a power failure. This stores the lost impulses and then feeds them back at a rapid rate when the supply is restored. When correctly adjusted the clock will not gain or lose more than 1/10 second per day.

[edit] Memories

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[edit] In the Science Museum's Records

Inv. No: 1975-244