Show makes powerful licht lesht adding a minute part of a rare metal rubidium to mercury usually used in mercury lamps has resulted in the development of it a lamp whose light approximates sunlight the metal causes the lamp to give red rays in addition to the mercury spectrum the lamp Is said to anve a ii life ten times as long as an ordinary incandescent lamp costs 7 a dram drain but only one rive five hundredths part of the metal Is used in each lamp to change the hue from green to aught red previously had improved the mercury lamp by adding potassium to the mercury but the potassium la Is said to disintegrate the glass bulb or tube of the lamp popular mechanics all magazine |