Bulletin of the National Research Council, Vol. 4: September, 1922, to December, 1922, Inclusive (Classic Reprint)

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Excerpt from Bulletin of the National Research Council, Vol. 4: September, 1922, to December, 1922, Inclusive When we adopt the conventional language of Euclidean geometry a gravitational field of Einstein's type is, in our opinion, comparable with a material medium with electric and magnetic polarizations. There is, however, the important distinction that in a gravitational field the coefficients a satisfy certain gravitational equations which are characteristic of Einstein's theory and to obtain a material medium whose properties are associated with a quadratic difi'erential form having coefficients of the right type we may have to introduce polariza tions which travel with velocity c. Fields arising from polarization of this type will be studied in Section 10. 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.