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. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.