. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. urnace will be found most suitable. Brassfounders air furnaces are most frequently sunk below the floor level, the ash pit beingclosed with a hinged iron grating. The covers for the furnace top may be either of cast or wroughtiron, and should be of a dome shape ; there should be a damper in the flue. The interior of thefurnace must be lined with firebricks set in fireclay. The crucibles used are either made of black-lead or Stourbridge clay. The latter are cheaper,but less durable than the black-lead, and
. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. urnace will be found most suitable. Brassfounders air furnaces are most frequently sunk below the floor level, the ash pit beingclosed with a hinged iron grating. The covers for the furnace top may be either of cast or wroughtiron, and should be of a dome shape ; there should be a damper in the flue. The interior of thefurnace must be lined with firebricks set in fireclay. The crucibles used are either made of black-lead or Stourbridge clay. The latter are cheaper,but less durable than the black-lead, and require to be carefully hardened by a gradual exposure tohigh temperatures. In mixing and pouring brass the least volatile metal should be melted first, the others beingplunged under the molten metal with tongs, in small lumps, which must be hot and quite dry. Thereason that the metal should be hot is that it may remain dry after being dried, as the steam fromany slight moisture on it when placed in the melting pot would probably send the molten metalspirting about in all
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectenginee, bookyear1879
