| 摘要 |
A terrestrial refractometer comprises a gastight enclosure containing a fixed mass of a gas which at least approximates to an ideal gas, at least a part of the enclosure being movable in response to changes in the volume of the gas in accordance with changes in ambient temperature and pressure; constraining means for constraining said movable part so as to maintain the gas at a constant volume; and sensing means for providing a signal related to the force applied to the movable part by the constraining means.
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