Cover of The Bridgemen’s Magazine, November, 1920.

The issue is from the Bridge, Structural and Ornamental Ironworkers’ convention in 1920, celebrating the 25th anniversary of the union. It was in 1920 described as the most successful convention to date. 

Photo courtesy of International Association of Bridge, Structural, Ornamental and Reinforcing Iron Workers.

See this image in the On High: Bridge, Structural and Ornamental Ironworkers exhibit.