About the author M. S. TROITSKY, PhD, has had extensive practical experience as a bridge engineer, designer, and consultant. After earning his doctorate in structural engineering from the University of Belgrade in 1943, he worked for twelve years as chief bridge engineer for the Foundation Company of Canada. There, he was responsible for the design and construction monitoring of nine major steel bridges, including arch, plate girder, suspension, truss, and cable-stayed bridges. He has also done consulting to private firms on structural problems, worked on the design of one cable-stayed bridge, and served as a primary designer on a two-span truss bridge reinforced by cables. Currently, Dr. Troitsky is Professor Emeritus of Civil Engineering at Concordia University in Montreal. He has also taught at the University of Montreal and McGill University, and at the University of California, Los Angeles.