[time-nuts] Time Nuts at PTTI this past week

[John Miles]

It is surprisingly hard to get a straight answer about what happens to g on
a mountain (http://www.newton.dep.anl.gov/askasci/phy00/phy00905.htm).  I
guess it's in the paper, but what source(s) did you use to arrive at the
1.5E-13 figure?

It might be interesting to take another expedition of the same distance,
speed, etc. but in a direction that would end up at the same altitude as
your home lab.  That way you'd presumbably be able to isolate the actual
influence of the mountain.

-- john, KE5FX


> With the differential elevation gain I had available here
> (between home and Mt Rainier is 1340 meters) the
> predicted relativistic effect on the mountain was about
> 1.5e-13. Roughly, to get a 10% accurate measurement
> I needed to use clocks that were 10x more stable than
> the effect I was trying to measure. Many of the older
> Cs I have collected from eBay aren't stable to 1e-14 at
> a day. In the end I hand picked three 5071A that were.
>
> /tvb
>
>