Excerpt from Compressed Air, Vol. 12: March to December, 1907, Inclusive Referring again to Fig. No. 3, it will be noticed that the lower edges of the caisson sides are sharpened to form the cutting edge Of the caisson, since they follow the level of the excavation and are pressed down by the great weight above. The contracting firm have prepared Special two - ton C. I. Weights, which can be piled on top of the concrete pier to further sink it in case the Skin friction on the sides is too great for the pier to Sink Of its Own weight. 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.