A refractometer for the measurement of the refractive index of the surrounding air is described, in which interference fringes are produced between two beams, one propagated in air, the other in vacuum. The accuracy aimed at is one part in 108, corresponding to the accuracy of the best vacuum wavelength standards used in the length measurement of mechanical standards. The refractometer is placed with the comparator inside an airtight isothermal enclosure and is operated from outside.
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J. Terrien (1965) studied this question.
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