Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 147,939 pages of information and 233,602 images on early companies, their products and the people who designed and built them.
Engineers of London.
1866 L. Smit and Zoon of Kinkerdyk built 2 steamers for the Cologne and Dusseldorf Steamboat Co with engines from Ravenhill, Hodgson and Co based on the model ship Iona which had been used on the Clyde
1871 "Miller and Ravenhill" built the pair of 250nhp engines for HMS Hecate. 
1872 Partnership change. '...the Partnership heretofore subsisting between us the undersigned, John Richard Ravenhill, Richard Hodgson, and William John Rusby, carrying on business as Marine Engineers, at Glasshouse-fields, Ratcliffe, and at Orchard Wharf, Blackwall, in the county of Middlesex, under the style or firm of Ravenhill, Hodgson, and Company, has been this day dissolved by mutual consent...'
1874 John Richard Ravenhill retired from the partnership