Excerpt from On the Strength of Cast-Iron Pillars: With Tables for the Use of Engineers, Architects, and BuildersI, in this formula, is the length, in feet, of a solid pillar of the diameter D, in inches, for which formulas (l) and (2) give the same breaking weight.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.