Excerpt from Mill Building Construction The weight of steel in the sides and roofs of mill buildings, with out cranes, is from 4 lbs. To 6 lbs. Per square foot of exposed sur face for the frame only. Corrugated iron sheathing weighs from 1 lb. To 2 lbs. Per square foot. These weights, with steel at 5_cts. Per lh., make the cost of steel buildings from 25 cts. To 40 cts. Per square foot of exposed surface. A rough approximate rule for calculating the extra weight of steel required in columns and girders when traveling cranes are used is as follows: Add 100 lbs. Of steel per lineal foot of building for every five tons of crane capacity. This would give for a 5-ton crane an addition of 100 lbs. Per lineal foot and for a 20-ton crane an addition of 400 lbs. Per lineal foot. 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.