Vacuum-Tube Lighting Again

Some time ago, as readers of The Literary Digest will remember, we heard a great deal about methods of lighting with vacuum-tubes caused to glow by means of the electric discharge. It was abundantly proved at the time that such light is easily produced and that it is very soft, white, and pleasant, but its production has not yet been put on a commercial basis. In The Electrical Review (January 5) Nikola Tesla, who has long experimented in this direction, gives some of the reasons why glow-tube lighting has not yet been financially successful, and predicts that it will soon be used widely for photography, if for no other purpose.