Excerpt from Preparation and Properties of Pure Iron Alloys: II. Magnetic Properties of Iron-Carbon Alloys as Affected by Heat Treatment and Carbon Content In a recent paper 1 the magnetic properties of a quenched and subsequently tempered eutectoid carbon steel were discussed. Particular use was made of the reluctivity relationship and its metallurgical significance. It was suggested that this method of analysis might also be applicable to the whole iron-carbon series. Since, through the metallurgical division of the Bureau of Standards, there were available iron-carbon alloys of unusual purity, it seemed desirable to extend the investigations on the eutectoid-carbon steel to alloys having higher and lower percent ages of carbon. This seemed especially desirable, since in nearly all previous investigations with varying amounts of carbon (some of which are discussed below) the test specimens contained appreciable amounts of impurities, particularly manganese. This paper gives, therefore, the results of such an investigation. While it is realized that care must be exercised in drawing general conclusions from results obtained with a limited number of specrmens, it is felt that the unusual purity of the Specimens used in the present investigation warrants the publication of the data and such conclusions as may be drawn directly from the evidence at hand. Further experiments are necessary in order to make generalizations. 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.

In 1901 the National Bureau of Standards (NBS) was founded to provide standard weights and measures and to be the national physical laboratory for the United States of America. The NBS conducted a lot of research in the fields of science and technology which were reported as "Scientific Papers." In 1988 the NBS became what we know now; the National Institute of Standards and Technology (NIST). This is one of those documents written by employees of the NBS.