Picture of the Master Clock 36A.
These clocks were originally made with a synchronising mechanism, consisting of a heart shaped cam returnable to its zero position by the operation of a roller cam being pressed onto the cam by a solenoid, driven by an external signal sent by land line from the GPO station at Rugby; such extras were removed by the manufacturers (as per the above example) if the clock went back to them for later repairs. Later versions did not have this mechanism fitted
Bildquelle: This work is licensed under the Creative Commons Attribution-ShareAlike 3.0 License Deben Dave
