. Transactions . combustion-chamber a large portion of the dust, which is deposited in the chamberI, and can readily be removed through the cleaning-door H. Itwill be observed that this gas is taken from a point in the combus-tion-chamber where a thorough mixture of the air and gas is to behad. Owing to the greatly increased volume and velocity of thegas passing through this stove, the tendency for accumulation of dirtwill be materially reduced, the strong draft carrying most of thedirty gases with it. For cleaning the stoves a very simple device isused, consisting of an ordinary piece of gas-
. Transactions . combustion-chamber a large portion of the dust, which is deposited in the chamberI, and can readily be removed through the cleaning-door H. Itwill be observed that this gas is taken from a point in the combus-tion-chamber where a thorough mixture of the air and gas is to behad. Owing to the greatly increased volume and velocity of thegas passing through this stove, the tendency for accumulation of dirtwill be materially reduced, the strong draft carrying most of thedirty gases with it. For cleaning the stoves a very simple device isused, consisting of an ordinary piece of gas-pipe, P, introducedthrough a single opening, O, at the top of the stove, and so locatedthat each and every flue-hole in the first down-pass may be case the upper part of the regenerator becomes encrusted withdirt, a scraping-plate and plummet with the proper sheaves is sub-stituted. The last two passes of regenerators very rarely if ever GORDON S WH1TWELL-COWPER EIRE-BRICK HOT-BLAST STOVE. 107 Fig. Plant of Three-Pass Stoves. Elevation. 168 GOKDON S WHIT W ELL-CO WPER FIRE-BRICK HOT-BLAST STOVE. require cleaning, as the whole deposit seems to be concentrated inparts where the gases are highly rarefied ; which, in any stove, is in-variably the first down-pass. This difficulty has been experiencedby those who have used the Cowper stove. Yet it is clearly demonstrated by practice that very little cleaningis necessary when the gases are passed through a dust-catcher. Bythe cleaning-device, as shown in the four-pass stove, great difficultyis experienced in removing the material in the numerous holes,through each of which only a few flues can be cleaned. This diffi-culty often proved to be the cause of poorly-working stoves. Muchtime was lost in removing these lids and the brick filling, and con-sequently the cleaning operation was postponed, until in many casesthe heating power of the stove was reduced to one-half its actualcapacity. The device shown in the three-pass
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
