Have you seen this http://www.telechron.com/
Jim Miller wrote: >On Jan 3, 2006, at 3:32 PM, Dennis O'Keefe wrote: > > > >>The Accutron was advertised to be accurate to a minute a month. >>Mine was +47 >>1/2 seconds at the end of the month. I no longer have that watch. >> >> > >My father used to work at a small (200 MW) municipal power plant and >when I was young (1970s) I would occasionally go along with him to >work. They had a Telechron clock and an Accutron right next to each >other in the control room next to the synchroscope meter for each >boiler/generator unit. The Telechron with its synchronous AC motor >was hooked to the generator main output and the Accutron was >naturally a "standalone" device. When off the grid they would trim >the steam throttles to adjust the frequency of their generators to >make the Telechron stay in agreement with the Accutron. Once it was >time to go back on the grid they would use the synchroscope to assure >that they were in phase with the grid. As you can imagine it would >be a very, very bad day if they were to close the tie breaker to the >grid while out of phase. The accutron / telechron arrangement was to >keep the clocks in the town accurate during the off-grid interval. > >Jim > > >_______________________________________________ >time-nuts mailing list >[email protected] >https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > > > _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
