![[Washing the Surface of the Arch]](/images/washing_the_surface_of_the_arch_asce_434_small.jpg "Washing the Surface of the Arch")
Description: Washing the Surface of the Arch.
Source: George S. Webster and Henry H. Quimby, "Walnut Lane Bridge, Philadelphia" (Transactions of the American Society of Civil Engineers, December 1909, vol. LXV, page 434).
Description: Washing the Surface of the Arch.
Source: George S. Webster and Henry H. Quimby, "Walnut Lane Bridge, Philadelphia" (Transactions of the American Society of Civil Engineers, December 1909, vol. LXV, page 434).