Heck as much as I like clocks I just want to see Adrians working HP 9815 calculator. Other comment for me at least is a good clock is a marvel by itself. Adding electronics removes the amazing engineering that went into the clock. By good I mean clocks few of us can afford. Though on time-nuts I have seen from time to time lucky people have found these clocks at affordable prices. Regards Paul.
On Thu, Nov 21, 2019 at 2:00 AM Matthew D'Asaro <[email protected]> wrote: > You are not the first to try this. The usual method for timing mechanical > clocks is either acoustic (a microphone picks up the sound of the > escapement) or optical (a sensor is blocked from light by the pendulum). > The optical method is more accurate but more cumbersome to setup. > > Matthew > > Sent from Matthew D'Asaro's iPhone > > > On Nov 20, 2019, at 6:18 PM, Adrian Godwin <[email protected]> wrote: > > > >> On Thu, Nov 21, 2019 at 2:01 AM Bill Beam <[email protected]> wrote: > >> > >> Most people interested in this problem have been dead for about 200 > years. > >> > >> I knew there was a reason why I didn't feel so well lately .. > > > > > > I have an electric pendulum clock by Bulle. A coil swings in a short arc, > > following a curved magnetic polepiece. At some point, contacts close and > > provide a timed sustaining impulse to the coil. > > > > Out of sheer pigheadedness, I am attempting to monitor the movement with > > antique (perhaps not quite so antique) timing equipment. I have an HP456A > > current probe to capture the impulse instance, an HP 5275A counter to > > measure the period and an HP101A oscillator to provide a reference. ADEV > > calculations might be done by an HP9815 calculator or perhaps an HP41 if > I > > can't find the 9815's parallel interface. Non-HP equipment is permitted > but > > nothing suitable has come up so far. > > > > A difficulty at the moment is that the contacts bounce somewhat, making > > the impulse timing poorly defined. I haven't yet got as far as seeing any > > mechanically caused pattern to the errors. > > > > Thanks to Tom for giving me more distractions to read :) > > _______________________________________________ > > 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. > > _______________________________________________ > 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. > _______________________________________________ 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.
