OCR Text |
Show Resists Resillts White DeatEven HeatEven neat Deat Heat neatEven Even when white hot hot . , tungsten isso Is Iso .0 0 so . o hard that It retains retain . Its i . shape andit and andIt andit It evaporates evaporate . slowly It does doe . notblacken not notblacken notblacken blacken electric light bulbs as quickly Quick quickly 17 ly a as . did carbon filament lament used wsed for forthe forthe ( or orthe the Hrst ftnt first quarter century ofelectric of electric electriclighting electriclighting electriclighting lighting Carbon has the highest highestmelting highestmelting highestmelting melting point of any known element elementbut . , but It also has baa a high Wgh evaporationrate evaporation evaporationrate evaporationrate rate |