Abstract
The usefulness of the Abbe refractometer equipped with compensating prisms can be limited seriously, for measurement of dispersions, by too liberal application of a blanket calibration chart to many individual instruments. Such a chart has been checked by calculation directly from the Abbe question for the dispersion. Incidentally, this basic formula is given in detail, in the algebraically exact and the approximate form, and also its derivation, which is not widely available. In addition, the expression was derived entirely in terms of the D-index of the test substance as the single independeng variable, which it is ultimately, a form not appearing in Abbe’s treatise.
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