| 摘要 |
A double cylinder comprises an inside cylinder around which a heater wire is wound and a cylinder disposed outside thereof, and a furnace body filled an adiabatic material. Since cool air from a liquid vaporization type cooling device is passed through a gap between the outside and inside cylinders while cooling the outside of the inner cylinder around which the heater wire is wound, and is then ejected, no air current is produced inside the inner cylinder and, consequently, there is no temperature fluctuation at the thermocouple portion in the vicinity of the sample. As a result, linearity of a line indicative of a temperature rise is improved when the temperature is raised from low temperature.
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