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A discussion of the theory and applicability of spectrographic analysis is given. The purified nickel was examined for all known, possible impurities spectrographically. Only traces of copper remained as impurities. The existence of boron and sodium in electrolytic nickel is pointed out. The temperature coefficient of electrical resistivity for the purified nickel was found to be 0.0064. The melting point for the purified nickel was placed at 1,458° C.
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Fink et al. (1931) studied this question.
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