"A new waterproof socket, introduced by the E. S. Greely & Co., is herewith illustrated. It is known as the Cartwright waterproof socket. It is claimed for the device that the porcelain itself, which forms the shell of the socket, is a thoroughly vitrified substance. The metal parts are fastened to the porcelain frame and do not depend for their security upon the sealing compound. The sealing compound itself is of a quality that will stand a zero temperature without deterioration and at the same time will admit of the heat that results from a 3 ampere lamp without softening, although the device is designed simply to meet the requirements of lamps from 1/2 to 1 ampere capacity.

"The Cartwright Waterproof Socket is made in three patterns to accomodate lamps of the Edison, Thomson-Houston and Westinghouse types. They are made, as shown in the illustration, with rubber insulated terminal wires projecting several inches from the shell to admit of rod connections."