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Jim crow (tool) : ウィキペディア英語版 | Jim crow (tool)
A jim crow is a tool for bending rails, consisting of a U-shaped or V-shaped armature with a hefty screw rod in its axis. Deluxe models are outfitted with rollers for continuous bending.〔 〕 Terry Pratchett uses this term in his novel Raising Steam. == Practice ==
Railway rails are quite flexible and bend easily to radii of 400m or more. The jim crow is needed to bend rails to tighter radii, especially near the ends.
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「Jim crow (tool)」の詳細全文を読む
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