The Heights over Foilhummerum Bay, Valentia, the William Corey Heading Seawards, Laying the Shore-end of the Atlantic Telegraph Cable, July 7th, 1866, 1865?66, Watercolor over graphite with touches of gouache, Sheet: 10 3/8 ? 15 3/8 in. (26. 3 ? 39. 1 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