Appleton's dictionary of machines, mechanics, engine-work, and engineering : illustrated with four thousand engravings on wood ; in two volumes (1873)
D. Appleton and Company · New York : D. Appleton and Co. · leaf 137
forms incrustations on the bottom and other parts of boilers, as ordinarily constructed, will settle downin this part in a loose unaggregated state. At I, in the centre of this bottom, is placed a blow-off valve,denominated a mud-valve, and which may be opened when requisite, for the purpose of…
Mechanical engineering · Mechanics · Engineering
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