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

paul swed paulswedb at gmail.com
Sat Nov 1 10:27:35 EDT 2014

It certainly depends on your comfort with any particular technology.
Be it discrete ICs or microprocessors what you ask for is indeed trivial to
The hardest part may be building the pulse driver and thats not really hard.
The telegraphs should have been a higher voltage to drive a 10-20 ma
current across the coil.
Leap second do not play into the operation as in 1900 there were not any.
Humor aside
Since the clock recals every hour (I suspect it runs slightly slow so that
the hand advances to 0) Then a leap second washes out 1 hour after it
I would just grab one of the rediculously cheap neo GPS modules and an
atmel tiny chip micro. But thats me.

On Sat, Nov 1, 2014 at 1:49 AM, Hal Murray <hmurray at megapathdsl.net> wrote:

> We had something like that in school when I was a kid.  (many years ago)
> I remember occasional click-click-click... as it got reset.
> mpb45 at clanbaker.org said:
> > I am wondering what the easiest approach to this might be?    I suppose I
> > could take the 1-sec pulses from a GPSDO (Trimble Thunderbolt ?) and
> count
> > 3600 of them to generate a momentary reset 3VDC signal.   In any event, I
> > thought I would pass this by the Time-Nuts gang to see if any feedback is
> > available as to what the least complicated (simplest) way might be to
> > accomplish this.
> Counting to 3600 won't work with leap seconds.  :)
> I don't know the details of how a pulse sets the clock hands.  I assume it
> can't set the time to a fraction of a pendulum swing so I don't see much
> use
> for something fancy like a GPSDO.  But this is time-nuts, so anything is
> possible.
> I'd probably split the project into two parts.  One is to keep good time
> on a
> computer, say something like a Raspberry Pi.  You can use the net, or a low
> cost GPS unit, or something fancy like a GPSDO.
> The second part is how and when to generate the pulse.  You can use GPIO
> pins, or modem control signals.
> You could use an old PC, but the payback due to reduced power will pay for
> a
> Raspberry Pi in a year or two depending on your power rates and how much
> power your old PC burns.
> --
> These are my opinions.  I hate spam.
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