Excerpt from A Remote Controlled Underwater Photographic Surveillance System The existing film supply roller is moved under the front opening (film inlet) to prevent film scraping. An auxiliary takeup film roller is installed under the rear opening (film exit) for the same purpose. Holes remaining in the lb-4a magazine, after modification, are plugged to prevent light leaks. A conversion kit is available commercially. 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.