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PO WALL CLOCK, 1970's
Slave units used in Telephone Exchanges and also in Post Offices for many years, these were driven by a master long case clock situated in the Exchange.
See Item A0073
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- We called these Pulse Clocks. They were driven by a pulse from the Master which was housed in a case about a metre tall with a glass front and long pendulum with infinite mechanical adjustment as I recall (fingers crossed!) The mechanism was great to watch as it gradually brought two brass tips together to trigger a relay and send the next pulse. I fitted many of these in our main exchanges in the North East.
.......... Terry Kirkup, Newcastle upon Tyne, 28th of July 2014