Excerpt from Proceedings of the United States Naval Institute, 1883, Vol. 9 If the energy transferred from the projectile to the armor be suffi cient to cause any part of it to affect the objects protected, the move ment causing injurious effects is a measure of surplus energy. All the remaining energy left in a projectile, or in parts of it, after passing through armor, is also surplus. In estimating the value of surplus energy, the effectiveness of its distribution is a most important ele ment. An energy that is barely sufficient to kill one man may, if properly distributed, disable a dozen, or that which would break a single piston-rod might disable two or more engines. If, in any armor experiment, all these factors of energy be summed up, the total will be exactly equal to the muzzle energy; and it follows, as a corollary to this assertion, that, knowing the amount of muzzle energy, the factors may be deduced from observation of the effects; and, when classified, and the laws of their variation are known, the relative value of armor-guns and of different types and dispositions of armor may be closely estimated. 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.