[time-nuts] Non electrical time-nuttery

[Bob Camp]

Hi

The Shortt pendulum is what I'm basing the dual clock torsion pendulum stuff on.

Bob


On Jan 9, 2010, at 9:02 PM, Lux, Jim (337C) wrote:

> 
> 
> 
> On 1/9/10 4:36 PM, "Bob Camp" <lists at cq.nu> wrote:
> 
>> Hi
>> 
>> If you abandoned the non-elecronic side of the requirement, you could hit it
>> with a pulsed LED and probably get phase data off of a couple of photo
>> detectors.
>> 
>> Crazy stuff ...
>> 
>> Bob
>> 
> 
> But that's the whole challenge... You can build an entirely mechanical clock
> with a performance of what? 4E-6 ADEV with a tau of 24 hrs (Harrison clock)
> 
> 
> A Shortt pendulum (whatever that is, I'll have to go look it up) is 1E-7.  A
> friend of mine was trying to build a 1ppm pendulum clock 15 years ago, with
> temperature compensated weights, etc.
> 
> So, can one build a 1E-8 performance clock, without electricity?
> 
> 
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