The Philosophical Magazine, 1798, Vol. 12: Comprehending the Various Branches of Science, the Liberal and Fine Arts, Agriculture, Manufactures, and Co

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Excerpt from The Philosophical Magazine, 1798, Vol. 12: Comprehending the Various Branches of Science, the Liberal and Fine Arts, Agriculture, Manufactures, and CommerceIt IS very uncommon to find pieces of this ore that are not mixed, and frequently even penetrated, with gray vitreous copper ore. That which accompanies the arfeniate of Huel Gorlaud mine, offers, in this refpeét, an uncommon and very particular appearance. The yellow ore is mechanically mixed with the vitreous ore, lo as to form a compound, in which, by the alliliance of a lens, the final? Particles belong ing to each of thole two ores may be very clearly difiinguifhed. The fpecitie gravity, as well as the quantity of copper, in this ore, varies coufiderably, according to the proportions in which the yellow copper ore and gray vitreous copper ore are mixed together, fometimes they leem to be mixed in equal propor tions, or nearly (0.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.