chunk: One day, the Duke finds Stuart Besser (Liev Schreiber), an amateur physicist (and descendant of Leopold) in his study perusing his schematic diagrams and taking photographs of them. He had seen him earlier at Roebling's speech about the Brooklyn Bridge, after he was laughing at the word "erection." Leopold follows Stuart and tries to save him from falling off the unfinished bridge, only to fall with him into a temporal portal between centuries that Stuart has used to travel to 1876.