![[Main Arch Centering, Walnut Lane Bridge]](/images/main_arch_centering_walnut_lane_bridge_asce_430_small.jpg "Main Arch Centering, Walnut Lane Bridge")
Description: Main Arch Centering, Walnut Lane Bridge.
Source: George S. Webster and Henry H. Quimby, "Walnut Lane Bridge, Philadelphia" (Transactions of the American Society of Civil Engineers, December 1909, vol. LXV, plate XVI, opposite page 430).
Description: Main Arch Centering, Walnut Lane Bridge.
Source: George S. Webster and Henry H. Quimby, "Walnut Lane Bridge, Philadelphia" (Transactions of the American Society of Civil Engineers, December 1909, vol. LXV, plate XVI, opposite page 430).