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Updated: May 24, 2025
They are tubes made from four or from eight sections rolled in the usual way and riveted together at their flanges. When necessary, such columns are joined together by cast-iron joint-blocks, with circular tenons which fit into the hollows of each tube. To join two bars to resist a strain of tension, links or eye-bars are used from three to six inches wide, and as long as may be needed.
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