Excerpt from Mechanics, or the Doctrine of Motion: Comprehending, the General Laws of Motion; The Descent of Bodies Perpendicularly, and Down Inclined Planes, and Also in Curve Surfaces, the Motion of Pendulums; Centers of Gravity, the Equilibrium of Beams of Timber, and Their Forces and Directions I I. Specific gravity, is the greater or lefl'er weight of bodies of the fame magnitude, or the proportion between their weights. This proceeds from the na tural denfity of bodies'. 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.