Excerpt from A Treatise on Mechanics Let us next suppose the force to be applied not in the direction of the axis itself, but parallel to it. Let A B, fig. 7 Q, be the axis, and let C D be the direction of the force applied. The pivots being supposed to be at A and B, draw A G and B F perpendicular to A B. The force C D will be equivalent to three forces, one acting from B towards A, equal in quantity to the force C D. This force will evidently produce a corresponding pressure on the pivot A'. The other two forces will act in the di rections A G and B F, and will have respectively to the force C D the same proportion as A E has to A B. Such will be the mechanical effect of a force CD parallel to the axis. And as these effects are all directed on the pivots, no motion can ensue. If the body revolve on a cylindrical rod, the forces A G and B F would produce a strain upon the axis, while the third force1 in the direction B A would have a tendency to make the body slide along it. 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.