sentences:  Knowledge had accumulated in the years since, much of it being cross-correlated by the East India Company's first hydrographer, Alexander Dalrymple, and subsequently by his successor, James Horsburgh.By the time of the Elwon/Moresby survey, the marine steam engine appeared to be racing to the rescue of British communications with India; the engine, first tested on Scottish lochs and American rivers, was by 1826 attempting the Cape route to India.In that year a 479-ton wooden paddle steamer, HEICS "Enterprise", steamed (mostly sailed in fact) from London to Calcutta.