[time-nuts] Antique pendulum clocks

[paul swed]

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 <medasaro at mit.edu> 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 <artgodwin at gmail.com> wrote:
> >
> >> On Thu, Nov 21, 2019 at 2:01 AM Bill Beam <wbeam at gci.net> 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 :)
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