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| Re: Master-slave clocks explained (580488) | |||
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Re: Master-slave clocks explained |
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Posted by Broadway Lion on Tue Mar 4 10:56:53 2008, in response to Re: Master-slave clocks explained, posted by RonInBayside on Mon Mar 3 19:56:39 2008. This is a function of the master clock. On the oldest systems, the master clocks were mechanical (pendulum-and-spring movement) with an electric motor connected to wind the spring daily. In the event of a power failure, the master clock would continue to run, but the electrically operated slave clocks obviously would stop. These systems could be fitted with the "pulse counters" I described to mechanically "save" pulses that the master clock generated but could not be delivered to the slaves. Even when pulse counters were not installed, these master clocks were always equipped with a means to advance all slaves in the system. This was usually a button or switch that would send pulses to the system rapidly, rather than once per minute.This is the kind of clock we have. Made by Holtzer-Cabot. It might not be the correct time, but it is the official time. The clock would also ring the bells, left over from the days when we actually ran a school here. A long paper tape would feed trough the machine, and someone would punch holes at the minute mark where the bell was supposed to ring. ROARING |
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