Current News and Notes - Vacuum Tube Lighting

According to newspaper reports Mr. Tesla is again working upon vacuum tubes. In an authoritative statement in the New York Sun he says: "The lamps are glass tubes which may be bent in any ornamental way. I most generally use a rectangular spiral, containing about 20 ft. to 25 ft. of tubing, making some twelve to fourteen convolutions. The total illuminating surface of a lamp is from 300 to 400 square inches. The ends of the spiral tube are covered with a metallic coating and provided with hooks for hanging the lamp on the terminals of the source of oscillations. The tube contains gases rarefied to a certain degree, determined in the course of long experimentation as being conducive to the best results." After discussing the subject in general terms, he wireless lamps, but a number of improvements must be made yet beadds: "I have no difficulty now to illuminate the room with such from that of Geissler, Moore and the several earlier ones of Tesla, is fore it can be generally introduced." Wherein this system differs not stated.