Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 535
ith Portlandcement concrete; a a are the air-locks. The sand was removed from thecaissons by water-ejectors. Arch bridges are of stone, brick, concrete, or metal; the parts of the archexert a direct thrust upon the abutments, resisted by the inherent weight ofthe latter, or its absolute fixed mass,…
Mechanical drawing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
