Show electricity and steel making EleAr felty in the commercial production of steel by use of the electric furnace Is used almost wholly as a source of hent heat rather than for any direct chemical action and the steel which results Is as a rule purer of higher quality than that usually oh ob t bained ined through other processes of nil all factors in the progress of shaping steel into usable cross sections tile the invention of tile rolling mill by cort soine time in the lie eighteenth century was the most important corts idea was ivas that steel could be squeezed into shapes bet betheen veen rollers while W M was still hot and from his idea grew the present day rolling mill industry which in the united states produces about 24 tons of finished product for every ton of castings that Is made chicago tribune |