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James Dredge of Bath challenged conventional suspension bridge theory when, in the 1830s, he patented his concept of chains of reducing thickness and inclined hangers. Few examples of his work remain but, until recently, Northern Ireland had four bridges left out of an original batch of five. D. McQuillan
An automatic, remotely controlled system for monitoring the inservice behaviour of the Foyle Bridge has been developed. Results of both static and dynamic test loadings of the structure are described. Preliminary results of the behaviour of the bridge under a variety of wind-load conditions are reported. T.D. Sloan, J.W. Boyd and A. Thompson
The barrel roof supported on Belfast trusses was widely used for industrial buildings in the late 19th and early 20th centuries because of its efficiency and economy for covering large clear-spans. The different forms of timber trusses used in the so-called ‘Belfast’ roofs are described and their historical origins discussed. M.H. Gould, Professor A. Jennings and R. Montgomery