The Philosophical Magazine, Vol. 6

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Excerpt from The Philosophical Magazine, Vol. 6: February, 1800A ftrong, hollow, inverted cone of crucible earth'ibeifig procured, with a correfponding {topper to fit it, made of the fame materials, the point of the latter is cut off about three fourths from the bafe. The platina, now in the {tate of a' light yellow powder, is preffed tight into the cone, and, a: cover being fixed ¿ightly on, it is placed in an air-furnace and the fire raifed gradually to a {trong white heat. In the mean time the conical fiopper, fixed in a pair of iron tongs fuitable for the purpofe, is brought to a red, or to a bright. Red heat. The cover being then removed from the cone, the' tongs with' the heated {topper is introduced through a hole in the cover of the furnace, and prelfed at firft gently on the platina, at this time in a {late nearly as foft as dough, till it at length acquires a more folid confiftence. It is then re peatedly {truck with the ¿ower, as hard as the nature of the materials will admit, till it appears to receive no farther im prefiion. The cone is then removed from the furnace, and being {truck lightly with a hammer, the platina falls out in a metallic button, from which Rate it may be draw n, by re peatedly heating and gently hammering, into a bar fit for ¿atting, drawing into wire, planifhing.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.