While still in Cork, Waller submitted a design for a new bridge to replace a wooden bridge on the UCC campus, over the
River Lee. It was destroyed by during storm flooding in November 1916. It was later replaced with a new bridge known as the Alumni Bridge or Newman's Bridge. He used this system during his time with the War Office. His system was adopted across the world. Later in his working life, Waller became preoccupied with famine, leading him to build factories in Africa, housing in India, Egypt, and Australia, as well as grain storage in Cyprus, and refugee accommodation in Jordan. Two engineers in Spain whom Waller met in the 1920s, adopted his techniques, building an airport, farms, and villas to a high standard. The majority of the projects Waller built in Ireland, such as garages and farms, have since been demolished, but one surviving work is his whiskey store at
Locke's Distillery, Kilbeggan, County Westmeath. The economy of the Ctesiphon system was met with hostility from building trades, particularly the Plasterers' Union. His last commission was for Seagram Chivas distillery at Paisley, Scotland, with Seagram buying the patent for the Ctesiphon system. They never used the system again, but paid Waller and later his widow a pension. Waller retired in 1953, to Devon. The
Irish Architectural Archive holds an album of his work, presented by his daughter Beatrice Carfrae. ==References==