Angelo James Sedley
A. J. Sedley of 38 Conduit Street, Bond Street, London.
1863 Reference to the 'scale beam bridges' invented to Angelo Sedley of Regent Street[1]. See below for description.
1865 Description of Sedley's patented new mode of constructing iron and steel bridges without the use of centering. Cantilevers were built out from substantial piers, and braced by tie bars connected to the top of king posts, and fixed to the cantilever and anchored into the ground. As building progressed, components would be raised from barges or other vessels on the river. Each cantilever would be extended to rather more than one third of the span. The cantilevers would support the roadway girders, typically of the lattice type.[2]
1867 Described himself as an upholsterer, at 38 Conduit Street, Bond Street[3]
1868 Sedley advertised tables of the sizes and capacities of his patented bridge, and stated that a bridge could be inspected at Messrs Maclellans of Clydesdale Works in Glasgow, and that his patent bridges were in use in England, Calcutta, Samsugar, Seurat, Bombay, and Colonies.[4]
1869 A pedestrian bridge on the Sedley system was built by the British Army across the Bassein River in the Bombay Presidency. There were two 50 ft spans and one 60 ft span.[5]
1879 Proposed a bridge to cross the Thames at the site now occupied by Tower Bridge, having a clear span of 750 ft and side spans of 150 ft (see illustration). The main span would comprise two cantilevers of 300 ft and a central girder of 150 ft. A major advantage would have been the ability to construct it without any staging in the river.