Show hardest known metal Is american product A new metal so BO hard that it will bore smooth holes in concrete or cut screw threads in a glass rod was exhibited for the first time at the recent convention of the american society for steel treating at philadelphia with present day tools such feats tire are difficult or even impossible the new material known as and consisting of tungsten carbide i I 1 compound of tungsten find and carbon and cobalt a metal like nickel Is the invention of dr samuel L floyt of the research laboratory of 0 the general electric company it Is so hard that it will cut glass like a diamond and will even scratch a sapphire which Is next nest below the diamond in the scale ui of har hardness duess ordinary steel tools fire are quickly worn down when held field against an emery wheel but the new metal itself wears down the wheel |