Show makes make powerful light adding a minute part of a rare metal rubidium to mercury usually used in mercury lamps has resulted result eid in the development of 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 have a life ten times as long as an ordinary incandescent lamp rubidium costs 7 a dram lint only one five hundredths part of the metal Is used in each lamp to change the light hue bue from green to light red previously physicists had improved the mercury lamp by adding potassium to the mercury but the potassium Is said to dl disintegrate the glass bulb or tube ot of the lamp popular copular mechanics Magi magazine zine |