. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. he clay. The effect of expansion cannot be avoided, but injury fromthe expulsion of moisture may be almost entirely prevented by a slow and careful process of heating,in which case the retorts will gradually acquire their intended colour without perceptible caution ought also to be exercised in cooling down when the oven is no longer required for 2x2 676 GAS, MANUFACTUKE OF. the season ; contraction if allowed to take place too suddenly, being most destructive in its effects,and great care s
. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. he clay. The effect of expansion cannot be avoided, but injury fromthe expulsion of moisture may be almost entirely prevented by a slow and careful process of heating,in which case the retorts will gradually acquire their intended colour without perceptible caution ought also to be exercised in cooling down when the oven is no longer required for 2x2 676 GAS, MANUFACTUKE OF. the season ; contraction if allowed to take place too suddenly, being most destructive in its effects,and great care should therefore be taken by closing up every aperture by which air can gainadmittance after the fires have been withdrawn, to sustain as long as possible the dead heat that isinside the bench. Figs. 1365 to 1369 are sections of retort settings generally adopted. Fig. 1366 is the method ofsetting retorts at the Chartered Gasworks; Fig. 1364 the method at the Commercial Gasworks:.Fig. 1369 at the Imperial Works, St. Pancras; Fig. 1367 at Gasworks at Valparaiso; Fig. 1368 at 1368. Westminster; and Figs. 1370, 1371, are of Hendersons superheated steam retort. The objectof this latter arrangement is improving the quality of the gas by the decomposition of the tarryvapours. The retorts are of iron, cast with a double bottom, so as to leave a space of about 1| to2 in. between the bottom on which coal and creosote are placed, and exposed to the fire. In thisspace an iron steam-pipe is placed, f of an in. diameter, screwed into the bottom of the mouth-piece, and extending nearly to the back of the retort. A similar pipe is connected with the boilerof the steam engine, but placed in the upper part of the main flue, so as to be exposed to thewaste heat from the retort furnaces; by this means the steam becomes highly heated before enteringthe retort. The steam on issuing from the open end of the pipe at the back of the retort, acquiresadditional heat, by passing over the surfaces of
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectenginee, bookyear1879
