The Bell System Technical Journal, 1947, Vol. 26

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Excerpt from The Bell System Technical Journal, 1947, Vol. 26: A Journal Devoted to the Scientific and Engineering Aspects of Electrical CommunicationAs the properties of various semi-conductors were known to vary widely, an essential part of the early work was a survey of the properties of a number of minerals and metalloids potentially useful as rectifier materials. There were examined and tested approximately 100 materials, including zincite, molybdenite, galena, iron pyrites, silicon carbide, and silicon. Oi the materials investigated most were found to be unsuitable for one reason or another, and iron pyrites and silicon were selected as having the best overall characteristics. The subsequent studies were then directed toward improving the rectifying material, the rectifying surface, the point contact and the mounting structure.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis 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.