Appleton's dictionary of machines, mechanics, engine-work, and engineering (1861)
Appleton, firm, publishers, New York. (1852, D. Appleton & Co.) · New York : D. Appleton · leaf 761
spread over the bottom, they would be found to make more and better gas thanDs and circular retorts, (where the stratum of coal is thicker,) simply because it would be more evenlyacted upon. In all cases, with the same degree of heat, the thinner the stratum of coal the better the gas. The mode of… … A A are the retort-mouths, the lids of which are fitted with stuffing-boxes, for the reason to be pre-sently described, and permanently jointed in their places with iron cement. BB are hoppers, capable of holding from 20 to 28 pounds of coal, which, when an air-tight slide-valve C is drawn back,…
Mechanical engineering
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