Journal of the Franklin Institute, Vol. 175

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Excerpt from Journal of the Franklin Institute, Vol. 175: Devoted to Science and the Mechanic Arts During the last few years - since 1907 - there has been a rapid displacement of the induction coil by a transformer type of apparatus for radiographic work. The transformer type of apparatus was developed in order to overcome the greatest objections to the induction coil, - namely, the use of "interrupters, " very low electrical efficiency, low time factor of secondary current, and limited secondary output from practical sizes of apparatus. The transformer apparatus has successfully overcome these defects of the coil and has introduced no real problems of its own. The first practical transformer type of Rontgen apparatus was installed in the Jefferson Medical Hospital of Philadelphia in June, 1907, where it still is in daily use. Since that time it has been installed in most of the laboratories of the prominent Rontgenologists and hospitals, both of this country and Europe. 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.