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Presumably successors to Miller, Ravenhill, and Salkeld after the death of Joseph Miller in 1860 (Miller had retired from the firm in 1852 due to ill health).
1860 Partnership change. '...the Partnership heretofore subsisting between us the undersigned, Richard Ravenhill, John Salkeld, John Richard Ravenhill, and Richard Hodgson, as Engineers and Steam Engine Manufacturers, and carried on by us at Glasshouse-fields and Blackwall in the county of Middlesex, under the firm of Ravenhill, Salkeld, and Co., has by arrangement been dissolved as from the 1st day of July, 1860; and by which arrangement the assets and liabilities of the said partnership have devolved upon the said John Richard Ravenhill and Richard Hodgson, by whom the said business is to be continued...'
c.1860 Provided the engine for the PS Leinster
1865 Richard Ravenhill retired from business.