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File:LOOKING NW, BRIDGE AT WEST FALLS (HAER No. PA-553) IN FOREGROUND. - Philadelphia and Reading Railroad, Schuylkill River Viaduct, Spanning Schuylkill River, southeast of HAER PA,51-PHILA,697-8.tif

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LOOKING NW, BRIDGE AT WEST FALLS (HAER No. PA-553) IN FOREGROUND. - Philadelphia and Reading Railroad, Schuylkill River Viaduct, Spanning Schuylkill River, southeast of Roosevelt Boulevard Bridge, Philadelphia, Philadelphia County, PA
Photographer
Eliott, Joseph, creator
Title
LOOKING NW, BRIDGE AT WEST FALLS (HAER No. PA-553) IN FOREGROUND. - Philadelphia and Reading Railroad, Schuylkill River Viaduct, Spanning Schuylkill River, southeast of Roosevelt Boulevard Bridge, Philadelphia, Philadelphia County, PA
Description
Nicolls, Gustavus A; Philadelphia and Reading Railroad; Consolidated Rail Corporation; CSX Transportation; Denison, Scoville, Candee and Company; Pennsylvania Historical and Museum Commission, sponsor; DeLony, Eric N, project manager; Consolidated Rail Corporation (Conrail), sponsor; Spivey, Justin M, historian; Borchers, Perry E, photographer; Elliott, Joseph E, B, photographer
Depicted place Pennsylvania; Philadelphia County; Philadelphia
Date 1999
date QS:P571,+1999-00-00T00:00:00Z/9
Dimensions 4 x 5 in.
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 PA,51-PHILA,697-8
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: The Falls Bridge is an early and ambitious implementation of the "false skew" method of stone arch construction, first used on an American railroad by the Philadelphia and Reading Railroad in 1848. The "false" skew is created by offsetting parallel arch ribs, avoiding the formidable geometry of a truly skewed arch barrel. Unable to find a willing contractor, the railroad's own workers executed the complex construction sequence, using a previous wooden bridge as falsework and maintaining traffic throughout.
  • Unprocessed Field note material exists for this structure: N632
  • Survey number: HAER PA-39
  • Building/structure dates: 1853-1856 Initial Construction
  • Building/structure dates: 1935 Subsequent Work
Source https://www.loc.gov/pictures/item/pa1647.photos.355698p
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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current14:57, 30 July 2014Thumbnail for version as of 14:57, 30 July 20145,000 × 3,994 (19.05 MB)Fæ (talk | contribs)GWToolset: Creating mediafile for Fæ. HABS 30 July 2014 (2901:3000)

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