[time-nuts] Improving the stability of crystal oscillators
brooke at pacific.net
Sat Oct 13 21:40:25 EDT 2007
Details on your experiment please.
Hole/pipe diameter, material?
Delta T at different depths vs surface ambient?
http://www.prc68.com/I/WebCam2.shtml 24/7 Sky-Weather-Astronomy Cam
Bruce Griffiths wrote:
> ); SAEximRunCond expanded to false
> Errors-To: time-nuts-bounces+brooke=pacific.net at febo.com RETRY
> Brooke Clarke wrote:
>>I've also looked into drilling a hole (garden hose, 90 deg fitting & pipe with
>>end smashed flat to make a nozzle will easily drill as deep as the pipe is
>>long). Then using a short length of capped copper pipe at the bottom and the
>>Like I think here in California wine country 4 feet would be plenty deep. But
>>this method only works at your home location. Not too good for a clock that
>>will be sent to someone else.
>>I think the long time constant method can be done in a few cubic inches.
> The required depth depends on the soil diffusivity and the temperature
> stability required.
> It is instructive to install thermometers at depth intervals of a foot
> or so and record the temperature fluctuations experienced by each
> This was first done around 1860 by Forbes.
> I repeated the experiment in 1966.
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