bearing in than compensate for the outlay involved. Here, no mind the large quantity of coals consumed in raising doubt, is one source of the variety of opinion enter- expense of fuel in the furnace, since the absorption of beat from the gases depends on the hight of material steam for generating… … 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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