Model making; including workshop practice, design and construction of models, a practical treatise for the amateur and professional mechanic .. (1919)
Yates, Raymond F. (Raymond Francis), 1895- ed · New York, The Norman W. Henley Pub. Co. · leaf 88
ng a metal box to hold thebone and the work, and then heat the whole to a high Hardening and Tempering Steel 85 temperature until sufficient carbon from the bone haspenetrated into the work. This is the method in generaluse for high-class work, and is recommended to themechanic. It is not necessary… … Fig. 54—Simple method of case hardening a small gear wheel, using a hlow torch ing it there for a considerable period—1 to 10 hours orlonger, depending upon the result wanted. After the impregnation with carbon, what we have isa skin or exterior layer of high carbon steel. It remainsto harden and,…
Machinery
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