📙 Excerpt from Annales de Chimie Et de Physique, 1870, Vol. 19Le travail élémentaire d'une partie est positif, si le dé placement de cette partie a lieu dans le sens de la force interne qui lui est appliquée, et négatif dans le cas inver'se. Un travail intérieur positif est donc l'effet des forces inter nes, agissant comme forces motrices, et un travail intérieur négatif est l'effet de ces forces, agissant connue résistances.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.