[time-nuts] Morion MV89A position
Hal Murray
hmurray at megapathdsl.net
Thu Jan 30 09:16:58 UTC 2014
> In the 70's I did a 4 inch pipe 20 feet in the ground in Dallas.
> Temperature was better than 0.1 C.
Over what time period? Dry ground or wet? How deep is your water table? ...
Temperature in the ground is a skin-depth problem. Lower frequencies will go
deeper.
Next time somebody digs a hole like that, it would be fun to put a string of
thermometers in it.
Goodies from google:
http://www.builditsolar.com/Projects/Cooling/EarthTemperatures.htm
http://topex.ucsd.edu/geodynamics/HW3_2011_presentations/C_wine_cellar.pdf
--
These are my opinions. I hate spam.
More information about the Time-nuts_lists.febo.com
mailing list