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Show Pastel Tints Of Rainbow To Be Shown San Francisco Invisible sunlight, sun-light, imprisoned within the walls of an amazing new lamp and bombarding bom-barding chemical powders, will ( h duplicate all the pastel tints of the rainbow in a $1,000,000 night illumination extravaganza for the palaces of the Golden Gate Inter-nation Inter-nation Exposition, to be held next ' year on Treasure Island in San Francisco Bay. This was announced by W, P. Day, Exposition Vice President t and Directors of Works. Simultaneously Simul-taneously in New York General Electric engineers announced their ' new tubular fluorescent lamb to the world. New "cool" light sources, sour-ces, producing colors rivaling the f rainbow, are made possible by the new lamp and will have their first large scale outdoor application at California's $50,000,000 Exposition. Twenty-three hundred of these new, revolutionary lighting tubes will be used in specially designed 'floodlights for providing colored illumination of the walls in the Court of the Moon, Court of Reflection, Re-flection, Court of the Seven Seas, Court of Flowers and for other locations, according to A. F. Dick-erson, Dick-erson, Manager of General Electrics Elec-trics illuminating laboratory and Tlluminating Engineer of the Exposition. Ex-position. "The possibilities of colored illumination il-lumination in exterior use are greatly multiplied by the develop-! ment of this new fluorescent tube,"' Dickerson said. I Pl "Efficiencies in terms of colored light have been stepped up in I some cases as much as 100 to l.1 Under this new light the walls of I the courts will become luminous I and iridescent in colo shades and ! tones which heretofore have been' artists' dreams that seemed beyond' practical accomplishment. For the first time we are able to mix lights as we do paints and produce, the theatrical results on large! areas at a reasonable cost that have been limited in the past to Van stage due to the expense." i Fluorescent powders compounded compound-ed and specially heat-treated in; the company's Nela Park labora- l tones hold the secret of the ef-i Cciency and color-producing qual-' ities of the new light sources.! ; Within their bulbs is a trace ofj ' fVrcury, a small amount or argon gas at low pressure, and a coating coat-ing of fluorescent powders, selected select-ed and blended to produce the I color of light desired. ! When current is applied, the ar-' gon serves as a "starter" and in r fraction of a second a feeble Dlue light with a large component of invisible ultra-violet radiation is generated inside the tube. This radiation strikes the fluorescent coating and is re-radiated in the visible range of spectrum. Each Bowder has its own characteristic Wave-band with which it responds to the ultraviolet, thus forming its own particular color of emitted i light. I The 1939 World's Fair of the West at San .Francsco will become a milestone in lighting progress' fiy pointing the way to future! widespread use of this new lamp, I illumination experts declare. |