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In some crystals only edges gave the light and others gave instead of a yellow light green, orange or blue. The writer would be glad of references to any published account of an investigation of this or any allied phenomena. On applying a potential of 10 volts between two points on a crystal of carborundum, the crystal gave out a yellowish light. Round was the eldest child of Joseph and Gertrude Round. For his service during the war, Round was awarded the Military Cross. To the Editors of Electrical World: SIRS: — During an investigation of the unsymmetrical passage of current through a contact of carborundum and other substances a curious phenomenon was noted. Round made important contributions to development of the first vacuum tubes. He was a personal assistant to Guglielmo Marconi.

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