IRON.

153

IRON. Flat Blast. To the account of this interesting innovation in the smelting°f iron ores, given in the dictionary, I have now the pleasure of representing inAccurate plans, the complete system mounted at the Codner Park Works belonging toWilliam Jessop , Esq. For the drawings, from which the woodcuts are faithfullycopied, I am iadebted to Mr. Joseph Glynn, F.R.S., the distinguished engineer of the“utterly Iron Works.

Figs. 85, 86, 87, exhibit the apparatus of the hot blast in every requisite detail.■The smelting furnaces have now generally three tuveres, and three sets of air heating

85

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* UtI >aces. The figures show two sets built together; the third set being detached on<,! C011nt of peculiar local circumstances. The air enters the horizontal pipe A, in the^ °und plan, fig. 85, on one side of the archqd or syphon pipes, shown in upright. ctl °n j a jig. an( j p asseg through these pipes to the horizontal pipe, B, on theS ^ e ’ wh ence it proceeds to the blast furnace. These syphon, pipes are flattened0r ally 5 their section being a parallelogram, to give more heating surface, and alsobp 0i ? of pipe (in the vertical plane), so as to make it stronger, and less liable to

by itg own weight when softened by the red heat. This system of arched pipet^P^^us is set in a kind of oven, from which the flue is taken out at the top of it;

[ thence again descends, before it reaches the chimney, entering it nearly at theel .°f the fire grate (as with coal gas retorts). By this contrivance, the pipes area bath of ignited air, and not exposed to the corroding influence of a current oftj,, e : The places and directions of these oven flues are plainly marked in thekJ awing.

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