HEWITT, PETER COOPER

(1861-. 1921), manufacturer and inventor; b. New York City; s. of Abram Stevens Hewitt and g.s. of Peter Cooper. He was educated at Columbia and at Stevens. Institute, Hoboken, specializing in electrical engineering. Entering busine with his father, he became a director of the Cooper-Hewitt and several other corporations and a trustee of Cooper Union. As an electrical engineer, he invented the mercury vapor lamp and the mercury vapor rectifier that bear his name, and a number of other mechanical appliances. He invented also devices to simplify the proce es of manufacturing glue at the Peter Cooper factory; also a hydroplane, improved methods of hatching fish, and developed the use of mercury vapor in the operation of wirele telegraphy.