BRUSH, CHARLES FRANCIS (1849-1929), American physicist, inventor and manufacturer, was born in Euclid, 0., on March 17, 1849. He graduated in mining engineering at the University of Michigan in 1869, and from 1870 to 1873 he practised as an analytical chemist in Cleveland, 0. For the next four years he was a commission merchant, dealing in iron and ores. In 1878, after successful experimentation with electric light ing, he produced the electric arc light which bears his name. This was the outstanding achievement of his earlier life as an inventor. In 188o he founded the Brush Electric Company which became the owner of his numerous patents in the field of electric lighting. The American Academy of Arts and Sciences awarded him the Rumford medal in 1899 for "the practical development of electric arc lighting" and in 1913 the Institute of Electrical Engineers conferred upon him the Edison medal. In addition to his research in electricity, he gave much study to gravitation and molecular physics. He died at Cleveland, 0., on June 15, 1929.