ELECTRIC LIGHT REVOLUTION.

Taranaki Herald, Volume LXI, Issue 144132, 30 June 1913, Page 6

ELECTRIC LIGHT REVOLUTION.

“SAVING OF 93 PER CENT.” Cold light—that is to say, light which is separated from heat, and therefore gives no heat—is tho latest development of electricity as an illuminant. The inventor of cold electric light is Professor Charles Francis Dussand. Professor Dussand is a former pupil of Professor Branly, who first discovered the principles of wireless telegraphy, and he conceived tho idea of applying tho law of rest to electric current. The adaption of tho principle has enabled him to apply to an electric lamp, or series of lamps a considerably larger quantity of current than tho maximum they are designed to absorb, thus obtaining such a powerful light as in ordinary circumstances would cause the lamps to burst in a few seconds. By using a series of rapid flashes and rests, each of the duration of . a frac tional part of a second, and so accelerated that the eye cannot detect them, an impression of continuity is conveyed, and the heat being separated from the light, the lamp does not become hot and burst, but remains cold. Two advantages are claimed for cold light—a savers in current of about 93 per cent,, ana an increase of illuminating power. Owing to the latter it is only necessary to use a miniature lamp. Cold light, it is stated, may be used for electric, lighting in general', military and naval purposes, maritime purposes, ornamental and academic.purposes, including cinematography, photography, etc. The increased illumination from cold light will, it is claimed, make it possible to supply the navy with powerful reflectors and projectors, which may be easily transported and fitted to the smallest boat. It could bo used in Morse signalling apparatus, searchlights, submarines, airships, and aeroplanes'. Another advantage claimed for cold light is that the danger of fire in cinematography is entirely eliminated.