[time-nuts] Antique pendulum clocks

[Dave Daniel]

I have two pendulum clocks, one a 1930s-era torsional pendulum clock from Bavaria and the other a swinging pendulum clock built around 1990. I will follow this thread closely.

Tom, you mentioned that there are lots of resources out there - can you elucidate?

Thanks.

DaveD

Sent from a small flat thingy

> On Nov 20, 2019, at 21:18, 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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