Abstract
The basis from which dispersion formulae should be derived for optical glass is considered, and expressions depending on a series of powers of the wave length investigated, using the figures given in the various Jena glass lists as the criterion for the selection of the index. To obtain further information of the accuracy of the resulting formula, it is applied to Gifford's figures. The comparison in general confirms the conclusion that the expression found, which only differs slightly from Conrady's second formula, is satisfactory, and further leads to the view that Gifford's results may require correction by amounts tabulated. The bearing of the formula on the secondary spectrum of thin lenses is discussed.
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