[time-nuts] 1903 Railroad self-Winding / Self-setting Clock

paul swed paulswedb at gmail.com
Sat Nov 1 11:36:40 EDT 2014

Bill I responded to Mike there seems to be a number of threads running on
So in fact you do have the telegraph coil in the clock. Makes sense to me.
Thats why the 100 V they needed to drive 10-20 ma through the coil over
distance and had to account for line loss.
The boook you mention. Online?

On Sat, Nov 1, 2014 at 8:00 AM, Bill Riches <bill.riches at verizon.net> wrote:

> I have the wall mounted version. I believe that the hour adjust solenoid
> took 100 volts or so.  I will check my manual on the clock.  At a minute
> before the top of the hour until a minute after the hour all traffic would
> stop on the WU lines and at the top of the hour a 100 v dc pulse came over
> the lines to reset the time.  I believe it was in the 30s when WU decided
> they did not want to be in the time business and discontinued the service
> and said everyone could keep their clocks.  I can imagine the next day
> clocks going home with office workers.  WU charged a buck a month for the
> clock, service, and batteries.  Many large offices had hundreds of these
> clocks.
> The book "American Clocks -Volume 2" by Tran Duyly has everything you ever
> wanted to know about self winding clocks.
> 73,
> Bill, WA2DVU
> Cape May
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