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USS Union (1841)
The first USS ''Union'' was a steamer designed and constructed by the U.S. Navy as an experimental improved version of its current steam-powered ships which were not considered as efficient as they should be.
''Union'' was laid down at the Norfolk Navy Yard, Portsmouth, Virginia, in 1841; launched in late 1842; and commissioned at Norfolk, Virginia, in early 1843, Lt. W. W. Hunter in command.
== Testing of a new design for propulsion of wheel-powered ships ==
The Navy tested various designs of propulsion machinery during the transition to steam power in the early 19th century. Among these first experiments were ''Union'' and ''Water Witch''—each fitted with an innovation named the Hunter Wheel.
The Hunter Wheel was named after Lt. W. W. Hunter and consisted of a conventional paddle wheel drum placed horizontally within the vessel below the water-line. The paddles were so arranged as to project from a suitable opening in the side of the ship when at right angles to the keel. Water was kept from entering by a cofferdam placed around the paddle wheel drum and against the side of the ship.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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