"Progressive electric light men recognize the fact that perfection in fixtures is as much to be striven after as perfection in the electric light itself. In fact without it perfection in operation can not be approached. A step in the right direction has been taken by the Electric Construction and Supply company of New York, whose new socket for incandescent lamps is illustrated herewith. It is claimed for this socket that by its use a perfect vacuum is obtained in the socket itself, and the consequent loss, where a socket which is not air tight is used, is avoided. It is said that the loss sometimes reaches ten per cent with socket not perfectly air tight.

"To describe the socket, D is a brass shell, fitting into the lamp of course. This fitting is made perfect by stretching over it the rubber cap H. The heat of the lamp vulcanizes the rubber to both the glass and the socket, thus rendering the passage of air impossible; E is a brass screw cap which screws into D. This fitting is also made air tight by a rubber washer which the screwing in of the brass cap presses tightly into the joint. Another rubber washer prevents the passage of air around the stem G. It will be seen that all of the places where the air generally gets through are protected by these thin rubber caps and washers. Although hardly on the market it is said that these sockets have already received the indorsement of some of the large incandescent companies."