STEINMETZ, Charles Proteus (1865-1923), German-American
electrical engineer and inventor, known for his research in alternating current. Originally named Karl August Rudolf Steinmetz, he was born in Breslau (now WrocNaw, Poland). Forced to leave Germany because
of his socialist activities, in 1889 he immigrated to the U.S. Four years later he was appointed consulting engineer of the General Electric Co., and in 1902 he became professor of electrophysics at Union College
and University, Schenectady, N.Y., thereafter serving in both positions until hisdeath. Steinmetz is best known for his research in the field of ELECTRICITY (q.v.) , particularly on the nature and use of alternating
current; his work contributed greatly to the utilization of electricity as a source of power and light in industry. Among his many inventions is the metallic electrode arc lamp.