Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 586
S;* / /^ >v ^ ;V ^ / Pure iron—nitrogenized by heating in ammonia, X75- of the grain, both of which tend to embrittle the metal. Suchconditions are corrected by annealing after welding, and for thisreason steels of high carbon (over .3 per cent.) or alloy content Nov., 1921.] Science of Electric… … Same as Fig. 16—quenched in water from 700°C. X50. Fig. 18.
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