Show FUSING MB PALS I Platinlum iridium and several other metals can only be fused In the oxyhydro gen blowpipe flame Of these iridium requires a temperature of 3512 degrees Fahrenheit to melt it Osmium a metal discovered in platinum ore in 1804 has noveryetbeon fused Osmium and iridium beside being the most non fusQ le metals are also the heaviest being each of them about twice the weight of the same bulk of lead When osmium is heated up to the temperature at which Iridium is fully melted it Qvaporates and deposits itself as a black powder on any cold object hold in the vapor while It takes fire In the air and forms totroxlde Osmium Is not used in the arts but tile alloy of osmirid tum which is not attacked by acid is employed em-ployed for tipping gold pens and occasionally occasion-ally for the bearings of marine compasses |