bearing in than compensate for the outlay involved. Here, no mind the large quantity of coals consumed in raising expense of fuel in the furnace, since the absorption of doubt, is one source of the variety of opinion enter- steam for gencrating the blast, and the further quantity heat from the… … ment of the material is to distribute it pretty equally flap valve opened by a chain, by means of which the through which they have to pass up: if this be dimin- over the furnace, not allowing all the large material to communication between the furnace and the descend- ished, the gases issuing from…
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