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 401
ovided at its lower end with a cast-iron pestle, (stamper-head,) weighing from 3 394 METALLURGY. to 24 cwts. each. These stamper-heads are made of the finest and hardest kind of cast-iron, such iroias chilled rollers are made of, and are cast in heavy iron chills, so as to harden the ivhole surface… … Into this hopper the ore is carried as it cornea aeoT.
Mechanical engineering · Mechanics · Engineering
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