A Photographic Method of Detecting Changes in a Complicated Group of Objects (Classic Reprint)
Liczba stron: 20
Wydanie: 2018 r.
Excerpt from A Photographic Method of Detecting Changes in a Complicated Group of Objects<br><br>An interesting application of the method would be its use in. Discovering the introduction or removal of an object, such as a battery, from behind a protecting screen which would allow so little direct vision as to absolutely preclude the possibility of the object being detected by direct observation. By eliminating the confusing details of the screen this method would permit the object to be detected and its general shape determined.<br><br>In certain types of engineering work progress can be very well Shown by an application of this method. For example, in the case of a bridge or other framework under construction provision is easily made for taking a photograph from the same position at frequent intervals of time. Then by superposing the proper positive and negative the progress in any period would be revealed without painstaking comparisons.<br><br>Changes in complicated documents, drawings, and engravings are brought out clearly by this method. This suggests its application to the verification of the copies of engravings, drawings, and the like.<br><br>While the best results can undoubtedly be secured by a skilled operator giving attention to all the factors discussed herein, yet the method can be used successfully in many instances by those having only a very limited knowledge of photography and by the use of comparatively inexpensive apparatus.<br><br>About the Publisher<br><br>Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com<br><br>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.