Farrow's military encyclopedia : a dictionary of military knowledge . ontains from threeto about five per cent, of carbon ; ordinary steel con-tains from three-fourths to one ]ier cent, of carbon ;while wrought-iron contains but a trace. In thechanging from the cast to wrought-iron in a pud-ling-furnace, the pig-metal passes through the con-dition of steel, that is to say, it is steel before it iswrought-iron. Now, making the puddled steel issimply slopping the common puddling process justat the moment when the decarbonizing mass undertreatment is in the state of steel. Several modifica-tions
Farrow's military encyclopedia : a dictionary of military knowledge . ontains from threeto about five per cent, of carbon ; ordinary steel con-tains from three-fourths to one ]ier cent, of carbon ;while wrought-iron contains but a trace. In thechanging from the cast to wrought-iron in a pud-ling-furnace, the pig-metal passes through the con-dition of steel, that is to say, it is steel before it iswrought-iron. Now, making the puddled steel issimply slopping the common puddling process justat the moment when the decarbonizing mass undertreatment is in the state of steel. Several modifica-tions in furnaces and processes have been patentedand various fluxes, especially manganese, are differ-ently used by different mamifacturers. See Puddlingand Stivl. PUDDLING.—Although the process of puddling issusceptible of considerable modification accordingtothe nature of the pig-metal employed and that of theiron which it is desired to produce, it may be gener-ally stated to include the following oiKTiitious ; down of the charge with or without the pre-. vious heating. 2d. Incorporation of oxidizing fluxeswith the-charge at a low heat. lid. Elimination ofcarbon by stirring the contents of the furnace at aliigh temperature. Ith. Consolichition of the reducediron to masses or balls fit for hammering. puildrmg-fiirnace is of the reverbera-tory form, one iti which thc flame is made to passover a bridge and then beat down again,or reverber-ate upon a hc-arth or surface on whir-li the matcrialHto be heated are placed. It is shown in the drawing,and consists of an oblong casing of iron plates (irm-ly bound together by iron tii--bars. and lined withfire-brick. Ihc tirephuc, F. is separated from theheartii. A. by a ./i/v-/«-/V/i/<. over which the heatedprriducls of combustion with a surplus of oxygenphiy upon the surface of the molten metal, effectingits conversion, and thence pass tlirougli the flue to alofty chimney, C in which is suspended a metaldanijicr-pl
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Keywords: ., bookcentury1800, bookdecade188, booksubjectmilitaryartandscience
