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 86
part ofthe metal which shows the finest silky grain and is toohard to be filed was heated to the proper temperature. Eepeat the operation, this time trying to heat about5 inches of the piece to the proper temperature, which issomewhere near 1450°F., depending on the quality ofthe steel. This time… … Fig. 53—A small piece of pipe used as an annealing oven piece hardened properly, tempering is next in order—that is, reducing the hard brittle metal to a tough pliablestate suitable for a spring, punch cutting tool, or what-ever is desired. Kemove the scale or oxide by grinding or polishingthe…
Machinery
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