Excerpt from Professional Notes It is, then, evident that if in a table we write in the first column the increasing thicknesses of the plates, and opposite to them the velocities necessary for a projectile of 1 decimeter, for example, to perforate plates having those tabular thicknesses, we may by simple divisions obtain the velocities necessary for a similar projectile of any caliber whatever to perforate the same thicknesses. Conversely, knowing the thickness of the plate and the caliber, we may obtain the velocity. We may also just as simply obtain the caliber, knowing the velocity. 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.