> I remember one someplace in London too. Science Museum in South Kensington, I'd expect, but I've not been there 20+ years.
-John > Someone mentioned temperature compensation. What would you need to > compensate for? Temp change in the wire wouldn't effect the rotation > as far as I can tell. Swing length might be different based on temp of > the wire I guess, but with a long pendulum, I think the magnet is > going to way overcome that issue. > > The one @ RPI had issues due to air movement in the shaft, but that's > a different problem. > > I suppose the right method is to use a GPS disciplined oscillator and > the appropriate divider to drive the magnet under the floor. :) To cut > down in draft induced drift and jitter, you'd have to put the whole > thing in a vacuum though! You don't want to drive it from a clock, IMO. You want to make it a free-running oscillator. Period is irrelevant. -John ============== _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
