[time-nuts] Pendulums & Atomic Clocks & Gravity

[Dr Bruce Griffiths]

Rex wrote:
> On Sat, 26 May 2007 19:54:21 -0700, "Tom Van Baak" <tvb at LeapSecond.com>
> wrote:
>
>   
>>> Even fused silica is unstable (see attachment).
>>> Single crystal materials should be significantly better.
>>> Ageing Invar doesn't do much for its dimensional instability.
>>>
>>> Bruce
>>>       
>> Nice plot. Thanks Bruce. Where'd you find it? Someday
>> I want to visit your library! You are just amazing.
>>     
>
> I don't know what most of those materials are, but looking at the plots,
> seems Super Invar and Zerodur tags both point to the same line. The line
> just above is unlabeled. I wonder which should be assigned to this line.
>
>
> _______________________________________________
>   
Rex

Dont even think about super Invar.
It was only this stable at a particular temperature.
When measured at a different temperature it proved no more stable than 
invar.

Bruce