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Old 8th Mar 2018, 12:27 am   #49
Join Date: Jan 2009
Location: Liverpool, Merseyside, UK.
Posts: 116
Default Re: Electric clocks running slow warning

In the late 70's we had a differential time indicator in the grid control room.
Basically a synchronous clock and a gents pulse clock both feeding to a differential gear with an indicator. the control room staff tried to keep the error below 1 min per day if I remember correctly (long time ago)

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