Transcript -- Using models, Professor Francis Evans explains how arches stay standing. John Trapp and Professor Jacques Heyman look at the arches at Ely Cathedral.
Transcript -- Professor Francis Evans shows why the pinnacles at Ely Cathedral are not just aesthetical, but how they balance out the forces within the structure.
Transcript -- John Trapp and Professor Jacques Heyman look at how medieval engineers managed forces within the stonework at Ely cathedral to extend an outer wall.
Transcript -- Professor Francis Evans takes Hooke's theory of arches, and explains that the forces at work witin an arch are the same as those in domes.