Abstract
WE have recently studied the effect of electron bombardment on rock salt crystal obtained from the Halle Company in Germany. It was found that the blue or colloidal coloration was produced on the surface of the specimen bombarded with electrons at high temperature1. In the course of the experiments we have also observed that the dark blue rings or circles were scattered on the coloured surface. In this communication we shall be concerned mainly with the behaviour of these rings or circles.
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