----- Original Message ----- From: "heiner thiessen" <[EMAIL PROTECTED]> To: "Sundials Mail List" <[email protected]> Sent: Saturday, February 14, 2004 8:52 AM Subject: solar clock
For many years before photo cells were installed street lamps were fitted with sidereal time clocks originally clockwork then mains synchronous. I had made an alarm "clock " from one as an inquisitive child and couldn't understand why the downstairs clockwork timepiece kept such poor time in comparison. My school timekeeping was very questionable. I am not sure if they would be accurate enough for your use if you could get your hands on one. I understand that short term mains frequency fluctuations are compensated for during the night time off peak hours. There are several circuits within the telescope building literature showing Quartz crystal controlled oscillators of bizarre frequencies to drive telescope tracking stepper and synchronous motors for various gear combinations. Maybe a standard drive could be used with very little modification. I hope I have understood the problem correctly Albert Brown -
