Show Makes Powerful Light Adding n a minute part of a metal meta I to mercury usually used in mel mercury cury lamps has re resulted In the development of a Lamp whose light approximates ht The metal cruses the lamp to give red rays In additIon to the mercury spectrum The lamp Is sold to have havea a life ten times as long lS as an or- or ordInary ordinary incandescent lamp costs j 7 a dram but only one five five- hundredths pert of the metal Is used in each lamp to change ch the lIght hue from green to lIh light t red PI Preciously C ph hind had improved the mercury lamp b by adding potassium to the mercur mercury but tile the potassium pot Is said ald to disintegrate time the glass bulb or tube tubo of the Popular lamp Mechanics II magazine |