Abstract
GROUND faces of calcite can be used with the view of obtaining large dispersion in X-ray spectrography. In a paper published in 19441, I showed that a face ground parallel to the lattice plane 655 (Miller's notation in the primitive lattice) yielded good results. The spacing for this plane is 1·032 A. Since then, I have made attempts with faces ground parallel to the planes 741 and 10·3·3, for which the spacings are 0·7165 and 0·533 A. respectively. In the accompanying reproduction the molybdenum KI±-doublet in the first order is recorded for a series of natural (211 and 310) and ground (655, 741 and 10·3·3) faces on calcite from Iceland. The photographs were obtained in a vacuum spectrograph of the Siegbahn type with an effective radius of 18 cm., 2-fold magnification.
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