Excerpt from The Purdue Engineering Review, 1914, Vol. 14 In Fig. 2, the curve a-a, co-ordinating external pres sures and lengths of the diaphragm, is determined experi mentally by varying the pressure surrounding the sealed diaphragm and noting the length. The curve b-b is also determined experimentally, and co-ordinates length of the diaphragm against internal pressure (gauge), and shows the internal-external pressure difference required to over come the elastic resistance of the walls of the diaphragm for various degrees of expansion. By adding the ordinates of these two curves we obtain the hyperbolic curve C-C, whose equation has the form X Y C. Solution of the curve locates the Y axis. 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.