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Excerpt from Direction des Ballons: Moyens Nouveaux Exp rimenter La pression des gaz comme celle des liquides, tant gale dans tous les sens on doit consid rer un ballon suspendu dans l'espace, par un temps calme, comme plac entre quatre forces gales, qui le maintiennent en se faisant quilibre. De quelque quantit qu'on augmente l'une de ces quatre forces, on la fera pr dominer sur les autres, et le ballon suivra son impulsion. Il suffit donc du plus l ger souffle pour donner un ballon une direction' quelconque. 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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