Abstract
Formulae for the natural dispersion and for the magnetic rotation are tested together by use of recently determined data for gases. Similar checks have been made by Evans and his co-workers for liquids. Dispersion equations of the Kettelar-Helmholtz type, with a single ultraviolet absorption term, together with Becquerel's equation for the Verdet constant are found to fit the experimental data in the case of the gases, acetylene, ethylene and carbon dioxide. The computed wave-lengths of absorption bands lie within the experimentally determined bands for these gases. Other constants of the two equations are also computed. For several other gases, methyl chloride, chloroform, oxygen, nitrogen and hydrogen, apparently more complicated formulae are required.
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