The Principles of Radiography (Classic Reprint)

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Excerpt from The Principles of Radiography The kind of electricity excited on a glass rod by rubbing it with silk was called vitreous, but is now known as positive electricity while the kind excited on an ebonite rod by rubbing it with ¿annel was called resinous, but is now always called negative electricity. The terms positive and negative arose from the fact that if equal quantities of vitreous and resinous electricity are placed on the same body, the latter shows no signs of electrification. The result of adding together equal quantities of Vitreous and resinous electricity is thus zero, and this result can be expressed mathematically by assign ing a positive Sign to the one and a negative sign to the other. It is therefore a convenience in the mathematical theory of electricity to regard the two kinds of electricity as being of Opposite Sign. 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.