Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 142,380 pages of information and 227,858 images on early companies, their products and the people who designed and built them.
of Marsh Place, London
1812 George Manwaring erected a 'Statical Hydraulic Engine' for Messrs. Cook and Co., at their Alum Works, near Whitby. This was fully described and illustrated in a Paper in 1826 . It was arranged as a beam engine, the cylinder being supplied with water at a head of 170 ft. The water supply incorporated an air cushion close to the engine to prevent damaging water hammer. The valve gear was cam-operated. The description and an illustration are also provided in Douglas Self's fascinating website 
1817 Patent in connection with steam engines.
1835: Bankrupts: George Manwaring the elder, William Manwaring, and George Manwaring the younger, engineers, York-road, Lambeth.