. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. given ofl, so that it is at all times false economyto protract the distillation beyond the ordinary period ; the additional cost of purifying materialand extra labour, besides depreciation in the quality of the gas, more than counterbalancing anyextra quantity that may be obtained. To define the time for distillation is, however, practicallyimpossible. Seven retorts in a bed is the number stated to combine most profitably the saving of fuel withproduction of gas manufactured when using common bituminous co
. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. given ofl, so that it is at all times false economyto protract the distillation beyond the ordinary period ; the additional cost of purifying materialand extra labour, besides depreciation in the quality of the gas, more than counterbalancing anyextra quantity that may be obtained. To define the time for distillation is, however, practicallyimpossible. Seven retorts in a bed is the number stated to combine most profitably the saving of fuel withproduction of gas manufactured when using common bituminous coal. Figs. 1363 to 1365 area front elevation, transverse section, and longitudinal section respectively, of such an cannel works three to five retorts are a maximum, but in these much higher heats are required ;the retorts being charged oftener, the heats are more difficult to maintain. The advantages of fireclay and iron as materials for retorts were long discussed among gasengineers, but fireclay gradually gained favour, and is almost universally adopted. 1363. Kound, flat D, and oval are the shapes employed, and each has its advocates. Flat D retorts have a more extensive and equal heating surface than the others, and on thataccount are supposed to produce a larger quantity of gas a ton of coals carbonized; but they areseldom found to expand and contract equally, and, how*^er carefully protected, the corner next thefurnace invariably succumbs to the fire. Round retorts contract and expand equally, and are always found to be more durable, but if GAS, MANUFAOTUEE OF. 675 made of a large size do not give good results in carbonizing. They are generally, for convenience,set with others of the oval shape, and these having the advantage, from their form, of a largerheating surface, combined with the strength of an arch, and regularity in expansion and contraction,manufacture more gas a ton than the round, and are nearly as durable. Clay retorts, when first heat
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectenginee, bookyear1879
