| 摘要 |
A hypsometer for use to calibrate thermometers having 1) an elongated vessel for containment of a working fluid, 2) a heating element for heating the fluid to its boiling point, 3) a vapor jacket to provide an escape path for the vapor, 4) a vapor chamber near the lower end of the vapor jacket, and 5) a thermometer holder to hold a thermometer at a position with its sensor tip inside the vapor chamber. Equalization of pressure between the interior of the vessel and the outside atmosphere is assured by allowing the vapor to escape through the vapor jacket. Near the lower end of the vapor jacket is a narrow opening where working fluid, in liquid state, collects to form a liquid seal, thus forcing the vapor through the vapor chamber before it can escape.
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