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Show Makes Powerful Light Adding a minute part of a rare metal, rubidium, to mercury usually used In mercury lamps has resulted In the development of a lamp whoso light approximates sunlight. The metal causes the lamp to give red rays, in addition to the mercury spectrum. The lamp Is said to have a life ten times as long as an ordinary or-dinary Incandescent lamp. Rubidium costs 97 a dram, but only one five-li'indredths five-li'indredths part of the metal is used In each lamp to change tho light hue from green to light red. Previously physicists had Improved tho mercury lamp by adding potassium to the mercury, but the potassium Is said to disintegrate the glass bulb or tuba of the lamp. Popular Mechanics Magazine. |