Excerpt from Terrestrial Magnetism and Atmospheric Electricity, Vol. 16: An International Quarterly Journal, March December, 1911 The land operations Of the Department Of Terrestrial Magnetism Of the Carnegie Institution Of Washington especially in regions more or less difficult of access, have emphasized the need of more portable and more compact instrumental outfits than heretofore in general use, without at the same time sacrifice in requisite accuracy. For _the regions here considered, in which the greater part Of our work must be done, travel is usually difficult and a bulky and heavy equip ment is, accordingly, a serious obstacle to safe transportation and rapid work. The conditions imposed make imperative also the omis sion of complicated and intricate mechanical devices, the adjustments Of which are generally difficult to make and maintain, as well as the avoidance Of a great number Of loose accessory parts, the loss Of any one of which may mean at times either the discontinuance or at least the serious interruption Of a campaign. Another essential feature in work Of this kind is that the outfit be such to admit advantage being taken Of every opportunity for Observations; the construction there fore Should permit practically immediate use and not require what may be the best part of the available time for setting up and assem bling various parts. 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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