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. and Contracting, vol. 70, no. 5, May 1931, pp. 115-117, 3 figs)
Ninety-four years of bridges at harpers ferry
Eng. News-Rec
Engineering News-Record ; 107 , n 12
1931
3 pages
3 Figs.
Aufsatz (Zeitschrift)
Englisch
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Ninety-four years of bridges at harpers ferry
Engineering Index Backfile | 1931
|Harpers bus memories in colour
SLUB | 2012
|Online Contents | 2002