Abstract

<p>An investigation has been made of the extent to which the relative refractivity of the atmosphere is invariant under changes in pressure and humidity. To achieve the necessary precision a refractometer with double-passed chambers 14.3 m long was designed for use in the photographic region. No fiducial line is employed. The relative refractivity of dry air was found to vary by less than 3 × 10<sup>-6</sup> over the region from 3890 to 6440 Å for a change in pressure of ½ atm. The relative refractivity of water vapor at low pressure in the region from 3610 to 6440 Å was found to be</p><p>δ¯H<sub>2</sub>O=0.961646+0.0086062 <i>k</i><sup>2</sup>-0.00010547 <i>k</i><sup>4</sup>+0.00001312 <i>k</i><sup>6</sup>,</p><p>where <i>k</i> is the vacuum wave number in µ<sup>-1</sup>.</p>

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