Excerpt from Electrical Resistance and Critical Ranges of Pure Iron In all, six iron thermometers were used from three samples, and all gave the same characteristics for pure iron. In Fig. 2 are shown the observations of the second heating and cooling curves taken with thermometer F - 6, which are typical of the behavior of iron, and in Fig. 3 the temperature coefficient of electrical resistance of pure iron, or more exactly the ratio of change of resistance of iron to that of platinum with temperature. In Tables 1, 2, and 3 are given the actual observations from which these curves are drawn, except that the lower region of the curve of Fig. 3 is plotted from numerous observations on several iron samples.
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