Excerpt from Terrestrial Magnetism: Results of Magnetic Observations Made by the United States Coast and Geodetic Survey in 1917 When in 1912 it was decided to confine the annual report of the Superintendent to administrative matters and to publish separately the scientific results which had formerly appeared as appendices to the report, the time was deemed opportune to change from the fiscal year to the calendar year in the publication of the results of magnetic observations in the field. Accordingly, Special Publica tion No. 15 contained the results of observations made between July 1, 1911, and December 31, 1912, Special Publication No. 20 the results for the year 1913, Special Publication N o. 25 the results for the year 1914, Special Publication No. 36 the results for the year 1915, and Special Publication No. 42 the results for the year 1916. 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.