Book Description

Excerpt from Elements of Hydrographic Surveying The object in view in the preparation of this work has been to furnish a text-book for the instruction of midshipmen at the U. S. Naval Academy; as a consequence, the subject has been treated with particular reference to the requirements of the course at that institution. The limitation thus placed has prevented the detailed description of certain features occasionally involved in surveying operations of the most precise nature, as, for example, astronomical transit observations; but all branches of the work connected with a marine hydrographic survey as ordinarily carried out have been completely described, and the book is therefore available for purposes of reference for naval officers and others that may be engaged in such work. In the preparation of the book, existing works on the subject were freely consulted, especially Phelps' Practical Marine Surveying, Wharton's Hydrographical Surveying, Bowditch's American Practical Navigator (revised edition), and Gurley's Manual of Surveying Instruments; and much valuable assistance was received from Mr. G. W. Littlehales, Hydrographic Engineer, of the Hydrographic Office of the U. S. Navy Department Acknowledgment is also made of the courtesy of Messrs. W. and L. E. Gurley, of Troy, N. Y., who supplied the illustrations of the various instruments. Certain methods described for measuring a broken base and for delineating shore-line, together with some practical hints on minor points, are the result of the author's own experience, and are not known to have been previously published. 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.