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A screw steamer or screw steamship is a steamship or steamboat, powered by a steam engine, using one or more propellors, also known as screws, to propel it through the water. The term is usually used in contradistinction to the paddle steamer, an earlier form of steamship that was largely, but not entirely, superseded by the screw steamer.〔Canney, 1998 pp.11-13〕 The screw or propeller was first developed by Swedish inventor John Ericsson for the U.S. Navy. Ericsson was the principal designer of the monitor class of vessels.〔Canney, 1998 pp.26-27〕 ==See also== * List of ships * 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Screw steamer」の詳細全文を読む スポンサード リンク
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