Mike I can't speak to the pendulum swing. I had seen clocks that did indeed have some form of mechanical lockout like you mention. So yes you are on target. Now we get to a bit of nitty gritty. When does the pulse arrive I suspect at 59:59. The goal is that the clock rolls up to 0 and is released by the pulse perhaps. So I mentioned that the pulse would be a higher voltage and 10-20 ma pulse. Thats telegraph behavior and if the telegraph coils not in the clock then as you say you are dealing with a 3V at some current pulse. One suggestion was a relay. Absolutely will work also solidstate relays they are cheap today and easily driven from a micro or traditional logic. I also suggested and agreed just buy a $21 maybe gps module as the source. They are really good cheap and very accurate.
OK how about those pictures you mentioned? :-) Now as the saying goes "Just do it". Regards Paul On Sat, Nov 1, 2014 at 11:06 AM, Mike Baker <[email protected]> wrote: > Time-Nutters-- > > This particular 1903 Railroad self-setting/winding > pendulum regulated clock needed only an hourly > signal from a Western Union telegraph line to > provide momentary closure of a relay contact. > This supplied +3 VDC to rewind the spring and also > reset the sweep seconds hand on the hour, every hour. > > From what I have learned about this, the resetting of > the sweep seconds hand is mechanically coordinated > to occur when the pendulum is at either end of its > swing. It appears that is no way (that I know of) to > guarantee that the "telegraphed" reset pulse would > coincide with either end of the pendulum's travel. > > Apparently, the resetting of the sweep seconds hand > will only occur within the time frame of any single > pendulum swing. I suppose this means that the clock > might be in error by as much as nearly one swing of > the pendulum because it has to reach the end of its > swing before the second hand is reset. > > Just guessing here, but I am thinking that all this > clock needs is a 1-second long closure of a relay > contact on the hour, every hour. I don't think > that leap-seconds are an issue here as the clock > can be manually adjusted for that whenever a leap > second occurs. So-- it comes back to counting > 3600 one-second pulses from a GPS clock...? Or > am I missing something here...? > > Mike Baker > ******************** > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
