. The book of the garden. Gardening. BOILERS AND PIPES. 235 excellent article, will show Mr Hood's method of setting his arched boilers. a is the furnace door ; b, ash-pit; c, the Fig. 317. Fig. Fig. 318. 1 nil IIII 1 k / 1 f c dumb or carbonising plate; d and e, small iron doors, for the purpose of extracting the soot from around the boiler;—a corres- ponding one on the opposite side is not shown, as the brick- work is supposed to be removed, to show the side of the boiler ; // are the upper and lower flues which pass round the boiler, separated by an iron flue-plate marked g; h, a bric
. The book of the garden. Gardening. BOILERS AND PIPES. 235 excellent article, will show Mr Hood's method of setting his arched boilers. a is the furnace door ; b, ash-pit; c, the Fig. 317. Fig. Fig. 318. 1 nil IIII 1 k / 1 f c dumb or carbonising plate; d and e, small iron doors, for the purpose of extracting the soot from around the boiler;—a corres- ponding one on the opposite side is not shown, as the brick- work is supposed to be removed, to show the side of the boiler ; // are the upper and lower flues which pass round the boiler, separated by an iron flue-plate marked g; h, a brick separation of the flue on top of the boiler; i and Tc, two fire-clay lumps, placed close to the back of the boiler. The space between them is from 3| to 4^ inches, according to the size of the boiler and height of the chimney. This opening is the only passage for the flame and smoke to pass through from the furnace into the flues. We have no doubt this latter contraction has a ten- dency to retain the heat longer in the oven of the furnace before it escapes into the chimney, and is consequently lost. On the same subject we have the fol- lowing remarks from Mr Ainger, in his Essays On the Production, Distribution, and Preservation of Heat, &c, published in " The Gardeners' Chronicle :"—" In the examples of boiler-setting usually published, not more than one-half or a third"—this is estimated much above the truth—" of the lower surface is exposed to the direct radiation from the fire, every- thing being sacrificed to the close contact of the fire with the water, and to the supposed efficacy of the air-carried heat in the circuitous flues. In this respect the conical boiler of Mr Rogers is a decided improvement, as it exposes the whole of its inner surface to the di- rect action of the fire, while it retains the error, as I deem it, of burning its fuel within cold ; In the ac- companying fig. 319, Mr Ainger explains his idea of eff
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectgardening, bookyear18
