of Saxony, near the bor- has two ribs or rings, each 21 feet 6 inches wide and ceeded from the middle toward each end. Eight men ders of Germany, and closely follows the graceful 9 feet 6 inches thick at the springing line, and 18 feet with sledges in six hours lowered the falsework suffi- outlines… … The voussoirs were then cult of solution centered Walnut Lane Bridge Over Wissahickon Creek. anchor-bolted to the con- about the weight of the crete piers as at first, and the upper and lower sec- of these carries ten vertical cross walls. The spandrel structure, and the isolated section to which…
Patents · Center · Concrete · Mechanical · Hammers · Scientific American · Apparatus · Cutting tools · Zinc bromid · American november · Main arch · Reinforced concrete · Flying machine · Moving picture · Petroleum fields · Years ago
Internet Archive · Public domain (published before 1931). Free to use for anything.
