); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Brooke Clarke wrote: > Hi Bruce: > > 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 > rest PVC. > > 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. > > Have Fun, > > Brooke Clarke > Brooke
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 thermometer. This was first done around 1860 by Forbes. I repeated the experiment in 1966. Bruce _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
