Show hardest known metal Is american r A new metal I 1 to 0 o hard that 11 ll bore smooth holes in concrete w screw threads in a glass rod wu habited for the first time nt at the re convention of the american fo tor for steel treating at philae with present day tools such featt all difficult 0 or even cen impossible till to material known us as tall slating of tungsten carbide 4 pound of tungsten and carbona carbon tri halt bait a metal like nickel Is the 1 tion of dr samuel L hoyt ot lit search laboratory of the gemeril trie company it Is 13 so hard M U will cut glass like ilke a diamond d e even ven scratch a sapphire below the diamond in the salt oll liar hardness duess ordinary steel tooti toa quickly worn down when held helda an emery cheel hoel hut but tile neff H itself wears down the |