Maybe these guys have what you need: http://www.popedewars.com/home.html
-John ============== > John & Don, > Thanks for your thoughts and ideas. Limited availability of different > sizes and shapes of vacuum bottle is a problem, but I'll be keeping > your ideas in mind when I make my selection. > Ed > On 7/30/2011 6:29 PM, J. Forster wrote: > > [snip] > > That will give you a static match, not necessarily a dynamic match. > Consider if you filled the Dewar with mercury. > > > Certainly a thermos of mercury would have much different thermal > behaviour than an oscillator, but I don't have a thermos of mercury. I > think what you're getting at is whether my replacement thermal system > has similar dynamic thermal characteristics to the original. > > Yes. You should, IMO, try to match the heat leak and the thermal inertia > to keep the loop dynamics the same. > > > Unfortunately, there's no way for me to test that since the original is > smashed. Static comparison is all I can do. > > You can try to keep the Dewar internals as near as possible to the > original. That and the leakage should roughly do it. > > Best, > > -John > > ============= > > > > Of course, if you go too far in reducing the current, the oven could > overheat. The oscillator includes a precision thermistor to monitor > the > temperature of the oven to prevent this. > > Any comments? > > Ed > > Good luck. > > -John > > > Thanks. This is turning into an interesting project. > > Ed > _______________________________________________ > 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. > > _______________________________________________ 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.
