[time-nuts] Improving the stability of crystal oscillators

Bruce Griffiths bruce.griffiths at xtra.co.nz
Sat Oct 13 23:41:51 EDT 2007

Brooke Clarke wrote:
> Hi Bruce:
> Details on your experiment please.
> Hole/pipe diameter, material?
> Depth?
> Delta T at different depths vs surface ambient?
> Soil type?
> Have Fun,
> Brooke Clarke

Unable as yet to find my data, it was published in some very obscure
publication if I remember correctly.
However there was extensive series of records kept in England from the
time of Lord Kelvin.

More recent data is available from the US forest service among others:
Above is for Wisconsin, not directly applicable to California.
Above paper by CSIRO is for an Australian site.
Analysis is fairly comprehensive.




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