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Japanese gunboat Ōshima : ウィキペディア英語版 | Japanese gunboat Ōshima
was a steam gunboat, serving in the early Imperial Japanese Navy.〔 page 116〕 She was named after the island of Ōshima off Shizuoka prefecture. ==Background and design== ''Ōshima'' was a steel-hulled three-masted gunboat with a triple-expansion reciprocating steam engine with two boilers driving two screws which gave her a speed of .〔Chesneau, ''All the World’s Fighting Ships'', p. 236.〕 Her design was based on a modified version of the and the French naval architect Louis-Émile Bertin contributed to her design. She is noteworthy in that she was the first ship to be built in Japan with a vertical triple-expansion steam engine.〔 She was equipped with four QF guns, one each on the bow, stern, and in sponsons on either side of the hull. Secondary armament included five Hotchkiss guns. ''Ōshima'' was laid down at the Onohama Shipyards in Kobe under direction of the Kure Naval Arsenal on 29 August 1889 and launched on 14 October 1891. She was completed on 31 March 1892.〔Nishida, ''Ships of the Imperial Japanese Navy''〕
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