Abstract
WE have applied multiple-beam interference methods to the study of abrasion test marks cut in diamond surfafces prepared for us by a new method due to P. Grodzinski (see above note). In this abrasion test the directional mechanical properties of the diamond are revealed by the sizes of the cuts produced in the various directions by (as near as possible) the same number of revolutions, under constant load, of a sharp grinding wheel charged with diamond dust. The accompanying illustrations are interferometric studies made on the cube top face of a truncated pyramid of a ‘glassy’ diamond, the same face, in fact, as that described in the preceding note by Grodzinski and Stern.
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