[time-nuts] Pendulums & Atomic Clocks & Gravity

[Rex]

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.