Hans Leth Ships Captain

My 3 X great grandfather Hans Helmer Leth born 1785 Aust-Agder was a ships captain. When his son Samuel Nikolai Leth died in approx 1864, Hans adopted my great grandfather Jorge Emil Leth (b 1854 Arendal) as his ships cabin boy. Jorge escaped while the ship was docked at Port Adelaide around 1870 during the Australian gold rush era. . I am searching for the name of the ship captained by Hans Leth so I can check arrivals in Australia . I would also wish to know on which ship was Jorge's father Samuel Nikolai Leth a ships carpenter before he died and if possible the circumstances surrounding his death.