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 898
ardness to its softest state, when subsequently reheated or tempered. In the process ofhardening steel, water is by no means essential, as the sole object is to extract its heat rapidly; andthe following are examples, commencing with the condition of extreme hardness, and ending with thereverse… … 864 TEMPERING AND HARDENING METALS. come rather hard, but readily admit of being filed. They become softer when placed on the coldcinders or other bad conductors of heat; still more soft when placed in hot cinders, or within thefire itself, and cooled by their gradual extinction. When the steel is…
Mechanical engineering -- Dictionaries
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