Developed by the Newport Torpedo Station, Rhode Island, before and during World War II. The upper photograph shows the Mark XIV Mod. 3 type Submarine Steam Torpedo, and the externally identical Mark XXIII type. These torpedos were 20' 6 long with a diameter of 21. The lower photograph shows the Mark XIII type Aircraft Torpedo, which was also used on Motor Torpedo (PT) Boats. This type of torpedo was 13' 5 long with a diameter of 22' 4. A shroud ring was later added around the tail fins of the Mark XIII torpedo. See Photo # NH 82842 for a photograph of a torpedo with this modification. U.S. Naval History and Heritage Command Photograph.