Excerpt from Lectures on Select Subjects in Mechanics, Hydrostatics, Pneumatics, Optics, and Astronomy Let the pipe A C be elevated to 10 degrees upon the quadrant, and filled with water; then part of the water that is in it will rise in the pipe A B, and if it be kept full of water, it will raise the water in the pipe A B from A to i; that is, to a level i 10 with the mouth of the pipe at 10: and the upright line a 10 equal to A i, will be the sine of 10 degrees' elevation which, being measured upon the scale S, will be about of such parts as the pipe contains 100 in length and therefore: the force or pressure of the water at A in the pipe A 10, will be to the force or pressure at A in the pipe A B, as to 100. 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.