[SEL] A Master clock with a Magneto

[Frank DeWitt]

There are many master clock systems.  Most old ones use a Pendulum master 
clock to close a contact once each minute to send a pulse to slaves.  Some 
had elaborate correction seams (IBM was one) , at least one used pulses of 
compressed air, but I was not familiar with this concept.

The master clock movement has what on this list can only be described as a 
impulse magneto (note the familiar two springs) to generate the electrical 
pulse once per minute and send it to the slave.

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Frank




  Frank DeWitt

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