Abstract
A new type of eyepiece is described whereby a spectrum is split into halves, a selected line of the one half being brought vertically above a selected line of the other. The intensity of the brighter line is then reduced by means of a neutral tint wedge until equality of the two intensities is obtained. The eyepiece is used in an analysis of some cadmium-lead alloys, an accuracy of some II per cent. of the cadmium content being obtained. Of the error 7 per cent. is due to irregularities of the wedge used.
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