. The American encyclopædia of commerce, manufactures, commercial law, and finance. lustre, and the fracture presents alamellar crystalline texture. It is more fusible than theothers, but it is very brittle, and so hard th.at it cJinnot beworked with steel tools. /. pos.ses.ses a property which is byno means common to all the metals. — a property upon whichchiefly depends its admirable suitability for receivinquit«d form by casting. At the t that a mass of the bulk increases, so that this metal is delicate markings from the moulds mprovement was ever effected than that introduced into / fluid
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. The American encyclopædia of commerce, manufactures, commercial law, and finance. lustre, and the fracture presents alamellar crystalline texture. It is more fusible than theothers, but it is very brittle, and so hard th.at it cJinnot beworked with steel tools. /. pos.ses.ses a property which is byno means common to all the metals. — a property upon whichchiefly depends its admirable suitability for receivinquit«d form by casting. At the t that a mass of the bulk increases, so that this metal is delicate markings from the moulds mprovement was ever effected than that introduced into / fluid metal .solidifies, capable of receiving evein which it is cast. — Noin any art by simple ismelting by the substiti furnace. When a current of col.I air is employed to urge onthe combustion, it is evident that a portion of the heat pro-duced is taken up in heating the nitrojen, which constitutesfour fifths of the bulk of atmospheric air, and takes no part mthe combustion. But when the air is healed to a high tem-perature before entering the furnace, no such cooling effect is. Fig.290. —Clt and Coxe. Othermodcsof eniploving the guses escaping from the chim-neys of the smelting furnaces have aUo been adopted. — t willberemembered that the most active agent in the reduction ofthe metal is thecarbonice oide gas produced in the furnace bythe incomplete combustion of the carbon of the coal. A largeexcess of this gas is produced, and escapes froni the chimneyof the furnace. The unconsumed carbonic oxide so escaping, together with the hydrogen and other combustible ga«s, foniumore than a third of the ga-ses i.<suing from the furnace. Itis the combustion of the.se inflammable ga-ses which producesthe lambent Barnes often s«n at the mouths of smelting fur-naces, and Imparting its most striking featunS to the nightview of an /.-smelting region. Until recently, all the heatproduced bv these flames was absolutely wasted, but by va-rious expedients a portion of the whole of thes