Frame, chocks and joins in merchant ships Old Street Square John Ross and his nephew

John Ross and his nephew James Clark Ross endured four winters trapped in the Arctic ice on an expedition to find the elusive Northwest Passage

View with barges in the foreground

on the River Thames and buildings on the north bank

Competitors in a dirt track race

Fashionably dressed figures stand underneath the balloon and on the balcony above

Frame, chocks and joins in merchant ships Old Street Square John Ross and his nephewPlate 8 figure 3 from the paper 'On a new principle of constructing ships in the mercantile navy', by Robert Seppings, Philosophical Transactions of the Royal Society, vol. 110 (1820), pp. 133 143. Two illustrations showing the frame curvature with chocks and the method of tying timber planks to the keel at the garboard strake. Original: ink on paper. 1820