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A capstan. Originally copied on the English Wikipedia by en:User:Leonard_G..
Capstan on the sailing ship Balclutha. Image by User:Leonard G.
Poles are inserted in the square holes and operated by sailors. The upper portion drives a shaft that operates the anchor windlass in the forecastle below.
Ligiloj al la dosiero
La jenaj paĝoj ligas al ĉi tiu dosiero: