Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 148,100 pages of information and 233,633 images on early companies, their products and the people who designed and built them.
William Eli Sudlow of Oldham invented a rotary engine in the 1870s
1874 Engine exhibited at the Peel Park Exhibition, Salford. Described in 'Engineering' magazine (see illustrations) 
Engine described in various journals 
Sudlow's engine patented in the USA: Patent number: 223257; Filing date: Nov 11, 1878; Issue date: Jan 6, 1880 
1876 Patent 4466 for improvements in machinery or apparatus for steaming and setting textile fabrics 
1877 Various references to bankruptcy of a William Eli Sudlow, living in Heaton Norris, Cheshire