File:Baltimore and Ohio Railroad, Bollman Bridge, Spanning Potomac River at Harpers Ferry, Harpers Ferry, Jefferson County, WV HAER WVA,19-HARF,28- (sheet 3 of 6).png

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HAER WVA,19-HARF,28- (sheet 3 of 6) - Baltimore and Ohio Railroad, Bollman Bridge, Spanning Potomac River at Harpers Ferry, Harpers Ferry, Jefferson County, WV
Title
HAER WVA,19-HARF,28- (sheet 3 of 6) - Baltimore and Ohio Railroad, Bollman Bridge, Spanning Potomac River at Harpers Ferry, Harpers Ferry, Jefferson County, WV
Depicted place West Virginia; Jefferson County; Harpers Ferry
Date Documentation compiled after 1968
Dimensions 24 x 36 in. (D size)
Current location
Library of Congress Prints and Photographs Division Washington, D.C. 20540 USA http://hdl.loc.gov/loc.pnp/pp.print
Accession number
HAER WVA,19-HARF,28- (sheet 3 of 6)
Credit line
This file comes from the Historic American Buildings Survey (HABS), Historic American Engineering Record (HAER) or Historic American Landscapes Survey (HALS). These are programs of the National Park Service established for the purpose of documenting historic places. Records consist of measured drawings, archival photographs, and written reports.

This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing.

Notes
  • Significance: Wendel Bollman's "suspension truss" patented in 1852 was the first iron bridge widely utilized by a railroad. Employing cast iron tension members, it was constructed over virtually every Baltimore and Ohio Railroad river crossing requiring pier to pier spans of less than two hundred feet. Because it appeared in such numbers at an important juncture in civil engineering history, as intuitive gave way to exact engineering and iron was widely being considered as a construction substitute for wood, Bollman's design received much attention. Its success helped usher in the era of iron bridges and the modern period of structural engineering. But success was short-lived. Competing designs required less iron. Unequal weight distribution among diagonal suspension members caused excessive stress that required frequent adjustment. Bollman's truss was obsolete by 1875.
  • Unprocessed Field note material exists for this structure: FN-22-A
  • Survey number: HAER WV-36
  • Building/structure dates: ca. 1868 Initial Construction
  • Building/structure dates: 1924 Subsequent Work
  • Building/structure dates: 1936 Demolished
Source https://www.loc.gov/pictures/item/wv0291.sheet.00003a
Permission
(Reusing this file)
Public domain This image or media file contains material based on a work of a National Park Service employee, created as part of that person's official duties. As a work of the U.S. federal government, such work is in the public domain in the United States. See the NPS website and NPS copyright policy for more information.
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