Publisher's Synopsis
Excerpt from Magnetic Variation in the United States: Being a Compilation of Observations Made in America From the Year 1640 to the Present Date; Tabulated and Arranged for the Use of Surveyors, With a Brief Account of the Nature of Terrestrial Magnetism
A brief resume' is given of the progress in the investigation of the subject of magnetic variation from the earliest periods of its discovery in England to the present time. The author has given as an example the method he used for redue ing the variation at adjacent points to that at his own place, and he recommends it as being simple and sufficiently accurate for the pur pose required. He would respectfully recommend to each surveyor the compilation of a similar table for his own particular locality, from which, by inspection, the variation at any date may be known. To enable him to do this without the preliminary labor involved in the collecting and sifting from a disconnected mass Of matter pub lished on the subject the information desired, the author has compiled this little work, thinking that, though imperfect as it may be, it yet may meet a practical need that others beside himself have felt. 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.
