[time-nuts] Self winding clock co. Weatern union clock

Brooke Clarke brooke at pacific.net
Sun Jan 31 22:02:41 UTC 2010


Hi Corby:

The clocks were on a synchronization line in series and the source power 
supply was 200 VDC.  A high power adjustable series resistor was in 
series to set the loop current.  The loop was closed one second prior to 
top of the hour and opened at the top of the hour.  The reason for the 
high voltage is that the time constant is L/R so the higher the R the 
faster is the circuit.  This is exactly the same as how Teletype 
machines are able to operate.  You can use a bench power supply in 
constant current mode and just turn up the current until the 
synchronizer pulls in and not the voltage across it.  See:
http://www.prc68.com/I/SWCC.shtml
http://www.prc68.com/I/SWCC2.shtml

Have Fun,

Brooke Clarke
http://www.PRC68.com


Corby Dawson wrote:
> Hi,
>
> I picked up a nice big clock that has "self winding clock co. New York"
> and "western union" on the face.
>
> After some research on the web I connected a 3V battery up and it wound
> itself OK.
>
> Fiddled with the orientation a bit to get the pendulum swing balanced and
> it seems to be running OK now.
>
> How to I advance or retard the hands to set the time?
>
> Also how do I test the synchronizer?
>
> I see two Fahnestock clips That look to connect to the synchronizer
> solenoid.
>
> With an appropriate interface can I synchronize it to a GPS 1PPH?
>
> Thanks,
>
> Corby Dawson
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