[time-nuts] Three subjects.
JayHolovacs
jayh6 at verizon.net
Wed Jan 4 07:22:54 EST 2006
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
>
>
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