Excerpt from The Miami Conservancy Bulletin, Vol. 1: March, 1919 The picture shows in more detail one of the traveling trusses referred to in Fig. 106. The truss is supported on vertical beams, as shown, these being carried on trucks with rollers which run on rails on the rock shelf on each side of the excavation. These rails, as shown, are at dif ferent elevations. The concreting chute appears slung from the truss by pulleys which permit its being lowered into place for action. The section, which runs up to the concreting track on the valley shelf, appears at the left (see Fig. The truss is just now engaged in helping move the right-hand outer section of the concrete form for the right-hand arch, which may be seen standing away from the completed concrete, and supported above by ropes and pulleys, ready to be carried along by the truss to its new position further down the conduit where it will be used in concreting the next section. The method of bracing and supporting the interior arch forms appears clearly in the picture. These interior forms also move lengthwise on rollers down the conduit to be used in the next section of the work. 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.