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Excerpt from Proceedings of the American Association for the Advancement of Science: Eighteenth Meeting, Held at Salem, Massachusetts, August, 1869 Finally, the practical value of the gnomonic projection is to guide more surely the mining operations and the geographical studies, as it is well ascertained that many grand circles of the earth are, altogether, the lines of dislocation of the earth's crust and the belt of mineral wealth of Similar origin. Such a relation is fully illustrated, both in Europe and America, by recent discoveries of metallic mines and mineral springs, and by the close study of the main features Of the two continents. However it must be understood that I engaged myself in the construction Of gnomonic maps, not in order to advocate any theory of the figure of the earth, but to collect facts and com pare them more easily than it is possible to do it with the actual systems of projection; these systems are excellent for several purposes, and we must keep them; but they require a complementary one, which is the gnomonic or radiated system. A map Of Europe, about forty square feet large, is quite finished since January last, and will be engraved in order to represent the geological structure of that continent. The original Sheet is in Paris (france), and will be brought to America as soon as the work Of engraving is completed. At the same time, my assistant is engaged in the drawing Of a special map of France, measuring about ten square feet, and a preliminary map of North America, of about the same size. 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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