But the invaluable and rather delicate art of tempering the hardened steel by a very careful and gentle reheating, which removes its extreme brittleness though leaving most of ifs precious hardness, needs such skilful handling that it can hardly have become known until very long after the art of hot-forging. [Please select]
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Every move must count, and the exercise must be finished with a minimum of reheating and retouching, for the best results. [Please select]
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Any irregularities in the finished joint may be corrected by local reheating, shrinking or blowing as required. [Please select]
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If too great shrinkage occurs, the place may be blown out gently after reheating. [Please select]
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The grain size is affected by the temperature at which the reheating is stopped, and not by the cooling, yet the cooling should be slow enough to avoid strains caused by uneven contraction. [Please select]
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In reheating the work it is necessary to make sure that no part reaches a temperature above that desired for best grain size and also to see that all parts are brought to this temperature. [Please select]
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