. American engineer and railroad journal . the practical error of supposing that the gases could be con-sumed by causing them to pass titrough incandescent effect of this plan is to convert the gas into carbonicojide ; and which, from being invisible, created the impres-sion that the smole was burned.^ It is needless here todwell on the chemical error of such an assertion. Thefallacy of imagining that either gas or smoke from a fur-nace can be consumed by passing throinj/i, oner or among a body of incandescent fuel prevailed from the days ofWatt to the present. Numerous patented plans
. American engineer and railroad journal . the practical error of supposing that the gases could be con-sumed by causing them to pass titrough incandescent effect of this plan is to convert the gas into carbonicojide ; and which, from being invisible, created the impres-sion that the smole was burned.^ It is needless here todwell on the chemical error of such an assertion. Thefallacy of imagining that either gas or smoke from a fur-nace can be consumed by passing throinj/i, oner or among a body of incandescent fuel prevailed from the days ofWatt to the present. Numerous patented plans to the sameeffect might here be given, all having the same defect, andequally ineffective. A plan devised by the writer, and probably by other per-sons, was to arrange the grates as in fig. 3, in which yl is agrate having an upward draft to which the raw coal is C are dependent water spaces, connected together by. a water-grate B. having a downward draft. The grate Ahas an inclination sufficient so that the coal, when it becomesincandescent, can readily be pushed forward on to thegrate B. In order to get over the defect pointed out byWilliams, openings/were made in the back ])late i> and asteam-jet/ was provided which blew steam into these open-ings and thus created an induced current of air into thespace above the grate B, which furnished the requiredamount of oxygen for the combustion of the gases from theraw coal in the upper grate, and of the fuel in the lowergrate. The arrows indicate the direction of the currentssufficiently well, so that further cx]>lanation is not plan, so far as the writer was concerned, never gotfurther than the speculative stage, but whether any one elseever put it in practice is not known. It seems to have somemerits, but the expectations that may be reasonably enter-tained of its performance might vanish in a practical test. Vol. LXVlI, No. 2.] AND
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