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Excerpt from Some Factors Affecting the Life of Machine-Gun Barrels Star-gage measurements on six machine - gun barrels at various Stages of firing indi cate that when the life limit is reached, exhaustion is due to a combination of the abrasive action of the bullet and the abrasion by hot gases. 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.