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Scientific American, Vol. 56, No. 22 (1887) (1887)
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o quickly move the bridge under all circum- latticed in pairs and united to form a box six feet deep the top of the center panel by four bars five inches stances. and six feet from center to center of girders. The The first proposed method of doing the work was to wide by 1% inch thick. These bars… … emporary-Draw Closed. “View of Old Draw, showing Side Track. - Temporary Draw Open. © 1887 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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