It would seem that George Bartram retired from business in 1871 & that after he retired the 'Bartram' business moved to what I termed on page 045 'a new shipbuilding yard' at South Dock. Agnes gigs (6 oared open boats), named Gipsy & O&M, rescued the passengers & crew & returned to salvage the cargo which included 450 (have also read 460) live cattle which had been spilled into the sea (& their handlers). on p.261), 2 (Miramar, link, you now must be registered to access).
Commencing about 1882, their record was a splendid one in the steamer class, and included ....."Later words make it clear that the Sunderland Shipbuilding Company site was on the beach since the text refers to broadside launches into the open sea. Just 20 pages but with brief (very brief) histories of the seven companies which then comprised the group. I presume that the two names above would be amongst the companies referred to. At launch, was named by Miss Wilson, of Sunderland. Built for William Watt, of Helensburgh (River Clyde opposite Greenock). to launch, p.133), 2 (Miramar, link, you now must be registered to access).