Show Tungsten of 01 Great Value Tungsten or wolfram Is a metallic ic icI element Isolated by the brothers d' d dl I t In after arter hud had In 1771 isolated acid Tungsten en U la not found native nathe but occurs aa as t the he of iron and manganese la 10 lathe n the mineral as as as' the line calcium calciu m te or as ns the trioxIde e en or wolfram ochre and in small quantities quan qua n titles In lu other minerals Tungsten ml min minerals n are almost utmost Invariably found In la latin tin ores It is used to Increase t the th hardness and tenacity of steel an anthus and ad ti thus Improve It as a II material for hard ha rd tools Coolidge has succeeded In n re ren n d tungsten malleable and duct ductile e and at present tunI tungsten wire 1 U h hIdel t tlde Idel t used for makin Incandescent Wi |