PHONE.
Gray's experiments won for him the decoration of the Legion of Honour at the Paris Exposition of 1878. He was for a time a manufacturer of electrical apparatus, particularly of his own inventions; and was chief electrical expert of the Western Electric Company of Chicago. At the Columbian Exposition of 1893 Gray was chairman of the International Congress of Electricians. He died at Newtonville (Mass.), on Jan. 21, 1901. Among his later inventions were appliances for multiplex telegraphy and the tel autograph, a machine for the electric transmission of handwriting. He experimented in the submarine use of electric bells.
Gray wrote, besides scientific addresses and monographs, Telegraphy and Telephony (1878) and Electricity and Magnetism (Igor).