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>Aha - so my machine that's been losing time all summer may start to gain time in winter? :)
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>This is sort of analogous to my piano, where I use a "Humidistat" to keep the strings from stretching/shrinking during damp/dry seasons.

Well, maybe it'll just not slow down as quickly. :-) Depends on the characteristics of the oscillator. But the humiidstat example is a good one. You can stabilize the device two ways, externally or internally. In your case you externally control the environment so your piano doesn't sound like something out a wild west saloon. :-) This wouldn't be easy to do in a satellite or the engine compartment of a car tho, so you need internal compensation. That's one reason why computer room envorinments were ( and some still are ) so closely controlled. Those ( what were then ) high-powered CPU's were really temperature sensitive.