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 time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts