Evolution from covered timber "arches" of 1836 to Bollman iron trusses and on to modern steel structures; Potomac River crossing of Baltimore and Ohio Railroad has made bridge history as well as reflected changes in railroad rolling stock and operating practices. (See also Eng. News-Rec vol. 107, no. 12, Sept. 17, 1931 pp. 446-448, 3 figs)
Ninety-four years of bridges at harpers ferry
Eng. Contracting
Engineering and Contracting ; 70 , n 5
1931
3 pages
3 Figs.
Aufsatz (Zeitschrift)
Englisch
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Ninety-four years of bridges at harpers ferry
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