. First century of national existence; the United States as they were and naoo. Tlio jiroooss is stillrosovtod to in pl:ioos whoro no lurn;\oos ai\within ivaih. Rut whorovor niiuos jtfo opon-od that proiniso suttioiout supplios of arc soon oonstruotod ii\ thoir vicini-ty. Thoso in uso arc of two sorts: thoSoofoh hoarth an>l thon^orhoratorv. Rosidosthoso. anothor small fun\aoo is ot\on builttor nioltiuij ovor tho sLipt. This is littleolso than a oruoihlo lM\ilt in hriok-work, aiularransTod tor tho Wast to ontor by an apor-tviro in tho baok. ;ind for tho to tunvout
. First century of national existence; the United States as they were and naoo. Tlio jiroooss is stillrosovtod to in pl:ioos whoro no lurn;\oos ai\within ivaih. Rut whorovor niiuos jtfo opon-od that proiniso suttioiout supplios of arc soon oonstruotod ii\ thoir vicini-ty. Thoso in uso arc of two sorts: thoSoofoh hoarth an>l thon^orhoratorv. Rosidosthoso. anothor small fun\aoo is ot\on builttor nioltiuij ovor tho sLipt. This is littleolso than a oruoihlo lM\ilt in hriok-work, aiularransTod tor tho Wast to ontor by an apor-tviro in tho baok. ;ind for tho to tunvout by anothor oponin^ in front, Tho Sootoh hoarth is a small blast furnace,but roson>blos tho open forjfi or blooniaryliiv for ir>M\ oivs. It has long boon in uso inluuvpo. and is tho invest ooninion atvHir own uiinos. In this country it h;is boonjjri\atly iniprvn-od by tho introduction of hotblast; and in its most perfect form is rop-rv^sentod in tho acconijwnyinsj tiguros; tiguro(I beiuji a vortical section frvMU front to back,and ligure b a horiaontAl SOOTVH nK\RTn rVRSACS. A is tho reserroir of lo*d of the fiiniace,c^>nsistinij of « box, ojhmi at top. aK>ut twofi,H>t st^uare and one f»H>t deej\ fonned ofcast irvni 2 inches thick. Fri>n» its upperfr^nit eisa hollow shell of cast iron J of an inch thick,its inner and outer sides inclosing a space of4 inches width. Into this .space the olast isintroduced at R, and becoming heated,passes out at K. and thence through thocurved pipe into a tuyere. T, c;»st in the air-chest J inches above tho level of the leadreservoir. Hefore eomnieneing operationsthis nsorvoir is to be tilled with lead, and isthus kept so long as the furnace is in use ;tho (process being conducted upon the sur-foco of tho ntoltod met
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Keywords: ., bookauthorhodgejam, bookcentury1800, bookdecade1870, bookyear1874
