The Engineering Contributions of Wendel Bollman

In the mid‑19th century, the arrival of iron transformed how bridges and buildings were built, freeing engineers from the limits of wood and stone. One self‑taught Baltimore civil engineer, Wendel Bollman, pioneered a fully iron bridge system that the Baltimore & Ohio Railroad adopted throughout its network. This monograph traces his early career and the birth of the distinctive Bollman truss, the first iron‑only design used repeatedly on a major American railway.

Listeners will follow the development of Bollman’s ideas, from his first iron bridge in 1850 through the expansion of his patented truss across the country’s growing rail routes. The author, a curator of civil engineering at the Smithsonian, situates these innovations within the larger shift toward metal construction, comparing Bollman’s work to contemporaries such as Whipple and Fink. The narrative blends technical explanation with the social and economic forces that shaped 19th‑century engineering, offering a clear picture of how a single invention helped launch the modern age of infrastructure.