File:AERIAL VIEW, LOOKING WNW. - Chicago, Milwaukee and St. Paul Railway, Bridge No. Z-6, Spanning North Branch of Chicago River, South of Cortland Street, Chicago, Cook County, IL HAER ILL, 16-CHIG, 120-4.tif

From Wikimedia Commons, the free media repository
Jump to navigation Jump to search

Original file ‎(5,000 × 4,000 pixels, file size: 19.08 MB, MIME type: image/tiff)

Captions

Captions

Add a one-line explanation of what this file represents

Summary[edit]

AERIAL VIEW, LOOKING WNW. - Chicago, Milwaukee and St. Paul Railway, Bridge No. Z-6, Spanning North Branch of Chicago River, South of Cortland Street, Chicago, Cook County, IL
Title
AERIAL VIEW, LOOKING WNW. - Chicago, Milwaukee and St. Paul Railway, Bridge No. Z-6, Spanning North Branch of Chicago River, South of Cortland Street, Chicago, Cook County, IL
Description
Bates, Onward; American Bridge Works; Chicago, Milwaukee and St. Paul Railway; Canadian Pacific Railroad; Chicago Department of Transportation, sponsor; DeLony, Eric N, project manager; Daley, Richard M, sponsor; Walker, Thomas R, sponsor; Kaderbek, S L, sponsor; Sears, Hannah, transmitter; Spivey, Justin M, historian; Lowe, Jet, photographer
Depicted place Illinois; Cook County; Chicago
Date Documentation compiled after 1968
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 ILL, 16-CHIG, 120-4
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 Milwaukee Road's Bridge No. Z-6 may be the only one of its kind ever built, defying the conventional categories of center-bearing and rim-bearing swing bridges. This ingenious design answers the constraints of a small site on a bend in the river. The 175'-2"-long plate-girder span bears on a short segment of roller nest turning at one-half the span's rate. This is accomplished by an unusual drive mechanism with two parallel racks. As a result, the roller nest need only turn through an arc equivalent to half of the span's rotation, reducing the bridge's footprint accordingly.
  • Unprocessed Field note material exists for this structure: N652
  • Unprocessed Field note material exists for this structure: N967
  • Survey number: HAER IL-162
  • Building/structure dates: 1898-1899 Initial Construction
Source https://www.loc.gov/pictures/item/il0842.photos.318242p
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.
Object location41° 51′ 00″ N, 87° 39′ 00″ W Kartographer map based on OpenStreetMap.View this and other nearby images on: OpenStreetMapinfo

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current15:35, 17 July 2014Thumbnail for version as of 15:35, 17 July 20145,000 × 4,000 (19.08 MB)Fæ (talk | contribs)GWToolset: Creating mediafile for Fæ. HABS 16 July 2014 (1201:1400)

You cannot overwrite this file.

Metadata

This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.

Retrieved from "https://commons.wikimedia.org/w/index.php?title=File:AERIAL_VIEW,_LOOKING_WNW._-_Chicago,_Milwaukee_and_St._Paul_Railway,_Bridge_No._Z-6,_Spanning_North_Branch_of_Chicago_River,_South_of_Cortland_Street,_Chicago,_Cook_County,_IL_HAER_ILL,_16-CHIG,_120-4.tif&oldid=774006689"