Show make makes powerful light ad ling in g a minute part 0 of a rare metal to mercury usually used in mercury lamps has resulted 3 in the development of a lamp whose I 1 light approximates sunlight the 41 n detal etal causes the lamp to give red rays in addition to the mercury spectrum rum the lamp Is said to have a life ten times as long as an or binary incandescent lamp rubidium costs 7 a dram but only one five i hundredths part of the metal Is used in each lamp to change the algi t hue from green to light red previously physicists I 1 ad improved the mercury i lamp by adding potassium to the mercur but the potassium Is said j to disintegrate the glass bulb or tube of 0 the lamp popular mechanics f magazine i y |