Terrestrial Magnetism

Angebote / Angebote:

Excerpt from Terrestrial Magnetism: Distribution of the Magnetic Declination in the United States for January 1, 1905, With Isogonic Chart and Secular Change TablesThe large number of new, reliable, and well-distributed determinations of the magnetic elements made by the Coast and Geodetic Survey, chie¿y within the past seven years, has made it possible to undertake the construction of new magnetic maps for the United States with an accuracy not hitherto attainable.In the present publication is given the first of these new maps - the one for which there is at present greatest demand - viz, the Isogonic Chart or the Chart of the Lines of Equal Magnetic Declination and of Equal Annual Change in the United States for 1905. There will appear later a special publication entitled The Distribution of the Magnetic Elements in the United States and Regions under its Jurisdiction for January I, 1905, which, besides giving the isogonic lines for the United States proper, will likewise give them for the outlying islands and territories under the jurisdiction of the United States, as also the Charts of the Lines of Equal Magnetic Dip and of Equal Horizontal Intensity for 1905. The common period selected for all of these charts, January I, 1905, is one for which, owing to the recent numerous reoccupations of repeat stations, the secular change reductions are, in general, well known over the entire region embraced.The last Isogonic Chart for the United States, for January I, 1902, was published separately and also appeared in the United States Magnetic Declination Tables for This chart, with the accompanying text and tables, was in such great demand that shortly after its issue a second edition was required, which in turn is almost exhausted. It was therefore urgent to issue a new chart for as recent a period as practicable and one which should embody the results of the many recent determinations of the mag netic declination and its secular change.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis 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.