📓 Excerpt from Annales des Mines, ou Recueil de Mémoires sur l'Exploitation des Mines Et sur les Sciences Et les Arts Qui S'y Rattachent, 1856, Vol. 9: MémoiresLa lettre P désigne toujours la 00 base a oo c (a étant l'axe antérieur, b l'axe latéral, c l'axe vertical) Les autres majuscules désignent toujours des faces parallèles à l' axe vertical.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.