Re: IBM Factory Clock
My master clock has an interesting synchronizing mechanism, once a day a pulse "zeros" the heart shaped cam keeping the 30 second pulse house clocks set. The pulse comes from a thing I made that receives MSF (the NPL time signal), originally this signal came from the GPO at 11:00 every day. However there is a bug, it could be two seconds out if the clock was a wee bit fast so I pulse twice, once a few seconds before the epoch and then again at the hour.
Master/slave clock systems are great fun, luckily I don't have room for more than one!
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