There was an interesting paper by W. A. Morrison (made the first crystal
controlled clock) in the July 1928 issue of Proceedings of The Institute of
Radio Engineers, pages 976-980, entitled "Thermostat Design for Frequency
Standards."
The article describes a crystal oven consisting of four layers: starting at
the outer wall - a layer of insulation, a heater, a distributing layer, and
an attenuating layer. He described a case wherein the temperature variation
is reduced by a factor of "at least 10,000 to one."
Of course this was for a passive crystal versus an active oscillator.
John WA4WDL
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