John Ericsson's Controllable Torpedo, 1873-1878
Photographed at the Newport Torpedo Station, Rhode Island, circa the 1890s. Developed during the 1870s and 1880s when the Torpedo Station was experimenting primarily with this type. The Ericsson torpedo was slow, noisy and impractical, but was the first torpedo to use two counter-rotating propellers mounted on a single shaft. Copied from an original photograph held by the Naval Underwater Systems Center, Newport, R.I. U.S. Naval History and Heritage Command Photograph.