Valentia, Ireland, from the Harbor, Opposite Knight's-town, at the Period of Laying the Cable of 1857, 1865?66, Watercolor over graphite with touches of gouache, Sheet: 9 7/16 ? 14 3/4 in. (23. 9 ? 37. 4 cm), Drawings, Robert Charles Dudley (British, 1826?1909), One of the 19th century's great technological achievements was to lay a telegraphic cable beneath the Atlantic, allowing messages to speed back and forth between North America and Europe in minutes, rather than ten or twelve days by steamer