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c1815 Born at Alston, Cumberland
1840 John Salkeld of Glasshouses Iron Works, Ratcliff, became a graduate member of the Institution of Civil Engineers.
For some years Salkeld was connected with the firm of Miller and Ravenhill before he was taken into the partnership.
At some point the firm became Miller, Ravenhill, and Salkeld.
and presume this is the same person:
1857 Birth of son Lewis Carruthers Salkeld to John and Catharine Salkeld, baptised in St Marylebone
1861 John Salkeld 44 (born Alston, Cumberland), civil engineer, lived in Ventnor, Isle of Wight with Catherine Salkeld 29 and Louis C Salkeld 3
1867 (last entry) Place of employment: Glass House Fields, Ratcliffe