The New Actinic Rays

Abstract

HAVING made some experiments on the lines laid down by Mr. Gifford, of Chard, I think the two enclosed photographs will prove of interest, as showing perhaps that Mr. Gifford's method of dispensing with a Crookes' tube introduces elements of another character. Both these negatives were taken without a tube, using the discharge from the terminal of a small Tesla transformer. In each case a metal plate was placed behind the film in communication with the other terminal of the coil. Under these conditions a stream of “discharge” passes from one terminal through the photographic film.