My firm has electrictime.com - sold power station master clock as part of Telechron - now we just make big tower and street clocks.
We have a bunch of master clocks in our museum - two in our on-line exhibit - I'm hoping to get a small article in IEEE Spectrum. One master clock was made in an vacuum chamber with an invar pendulum. My clocks are shown https://electricclock.omeka.net/items/show/6 https://electricclock.omeka.net/items/show/12 Mark Frank has some restored units at http://www.my-time-machines.net/master_clocks.ht In the 1970's we made a cheap power station clock for some islands - it consisted of a synchronous wall clock next to a quartz battery power clock - the operator keep the synchronous clock in phase with the quart clock. BTW the little red flag was a part of a patent fight - Telechron had a patent on self-starting synchronous motor the non-self-starting clock companies got a law or regulation that a clock had to had a notification power had been off - they thought they had him - but he came up with a creative solution. Thomas D. Erb p: 508-359-4396 f: 508-359-4482 a: 97 West Street, Medfield, MA 02052 USA e: [email protected] w: www.electrictime.com Tower & Street Clocks Since 1928 _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
