Excerpt from Calculated Tables of Ranges for Navy and Army Guns: With a Method of Finding the Distance of an Object at Sea IN publishing the following Tables of Ranges, the author does not pretend to say that they are theoretically exact. His attention was first called to a solution of the problem, in a general manner, by Commander W. N. J efi'ers, of the Navy. After a patient search in all the books of reference at his disposal, he still found the problem covered with obscurity, and it struck him that the obscurity arose from the method of treating the subject: for instance, the resistance of the air to a shot passing through it is given in pounds, when I thought it should be given in terms of its velocity. The law usually assumed has been, that the resistance increases as the squares of the velocity; this is not strictly true, and I thought it more simple at once to deduce the retardation caused by the atmosphere. This put the problem in its simplest form, and is easily solved. It will be seen that in computing the horizontal range I have neglected the effect of gravity, for, since the horizontal ranges are given by experiment, the question of gravity does not enter into the problem at all. But, with regard to the angle of fall and the final velocity, I here introduce. 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.

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