Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts (1880)
D. Appleton and Company, Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 324
placed in various parts of the boiler, especially if the water which is used givesmuch scale. Cast-iron plates, one from the inside, the other from the outside, held tight by a boltand a nut, close the hand-holes. A blow-off cock is usually screwed to the bottom of the back sheet(A, Figs. 2843 and… … water-pockets are either suspended from the crown-sheets, raised from the bottom, or joined to thewater-spaces of two sides of the fire-box. The object of such arrangements is to increase the directheating surface, and to create combustion-chambers, where the flame can be thoroughly mingled withair…
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