Commanded by Lieutenant Charles Wilkes, 1838-1842 Brig Porpoise (center) and schooner Sea Gull (left) separating in heavy seas, probably off Antarctica in March 1839. Engraving by Jordan & Halpin, after a sketch by Lt. Charles Wilkes, published in U.S. Exploring Expedition, Volume I, page 138. U.S. Naval History and Heritage Command Photograph.