Download or read book Scherzer Rolling Lift Bridges (Classic Reprint) written by Albert H. Scherzer and published by Forgotten Books. This book was released on 2017-11-16 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Scherzer Rolling Lift Bridges The Essential Requirements of a Movable Bridge Are 1. The bridge must be absolutely safe for all traffic cross ing it and for traffic using the navigable channel. 2. The bridge must cause the least possible delay to the traffic crossing it and to the traffic using the navigable channel. 3. The bridge should provide the widest possible navi gable channel at a minimum cost. 4. Economy of first cost of the bridge, economy of opera tion and economy of maintenance. 5. Economy of space required for the site and operation of the bridge. 6. The bridge must not encroach on the adjacent dock space. 7. The bridge should provide one ample, unobstructed navigable channel in the middle of the waterway. 8. The main structural moving parts of the bridge should be few and simple. 9. The bridge should move with the least possible fric tion because of its comparatively great weight. Io. The operating machinery, locks and equipment of the bridge should be few and simple. II. The bridge should be very rapid in operation. 12. When open, the bridge should form a barrier closing the highway. 13. The bridge should be as rigid as a fixed bridge, under the heaviest moving loads for both highway and railway traffic. I4. The bridge should have pleasing and artistic outlines. 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.