Excerpt from Some Optical and Photoelectric Properties of Molybdenite The present paper gives data on the spectral photoelectric sensitivity of molybdenite, under various conditions of operation. Molybdenite was selected for detailed examination because it is one of the few minerals available which is sufficiently homogene ous to determine various optical and electrical properties, all of which data may prove useful in arriving at an explanation of the phenomenon of change in electrical resistance of certain sub stances when exposed to thermal radiation. 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.