Excerpt from United States Army X-Ray Manual: Authorized by the Surgeon-General of the Army, Prepared Under the Direction of the Division of Roentgenology There is, of course, no clear line of demarcation between military roentgenology and roentgenology of civil practice. It is the same art, but practiced under different circum stances and, sometimes, with an entirely different type of apparatus. The principal aim in the preparation of this manual and in the courses of instruction carried on by the Medical Department has been to familiarize the already experienced roentgenologist with the apparatus with which he is to work, and to give him additional instruction along any lines in which he may be deficient. The need for a large number of roentgenologists, however, has rendered it necessary to train for this work physicians who have had little or no previous experience and, for this reason, it has been necessary to cover in the manual practically all phases of roentgenology. 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.