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Excerpt from Acta Academiae Scientiarum Imperialis Petropolitanae, Vol. 1: Pro Anno 1781 <p>Ouvrages, Machines Ò' Invention; prefinte'e: ou vomnzunz'gne'enìz l'académie, pendant le mum du premier Sémejìre de i'anne'e 1781. <p>About the Publisher <p>Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com <p>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.