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File:VIEW OF GEAR DRIVE TRAIN FROM EAST GEAR ROOM LOOKING NORTH. - West Division Street Bridge, Spanning North Branch of Chicago River at West Division Street, Chicago, Cook County HAER ILL, 16-CHIG, 162-6.tif

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VIEW OF GEAR DRIVE TRAIN FROM EAST GEAR ROOM LOOKING NORTH. - West Division Street Bridge, Spanning North Branch of Chicago River at West Division Street, Chicago, Cook County, IL
Title
VIEW OF GEAR DRIVE TRAIN FROM EAST GEAR ROOM LOOKING NORTH. - West Division Street Bridge, Spanning North Branch of Chicago River at West Division Street, Chicago, Cook County, IL
Description
Pihlfeldt, Thomas G; Ericson, John E; Fitzsimons and Connell Company; Roemheld and Gallery; Chicago Department of Transportation; Chicago Department of Transportation, sponsor; Daley, Richard M, sponsor; Walker, Thomas R, sponsor; Kaderbek, S L, sponsor; Hess, Jeffrey A, historian; Lowe, Jet, photographer; Koslow, Julia, delineator; Gardner, Lisa, delineator
Depicted place Illinois; Cook County; Chicago
Date Documentation compiled after 1968
Dimensions 5 x 7 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, 162-6
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: When Chicago became a major commercial and industrial center after the Civil War, the most common American drawbridge was the swing bridge, horizontally rotating on a center pier to open two navigation channels. The center pier, however, became a navigational hazard for the ever-larger craft of the late nineteenth century, especially on crowded, narrow waterways such as the Chicago River. During the late 1890s, Chicago City Engineer John Ericson initiated a planning study to find an alternative to the swing span. Finding inspiration in the 1894 Tower Bridge in London, England, the municipal engineering staff developed a new movable-bridge design. The type was known as a double-leaf bascule, French for "seesaw." Each movable leaf rotated vertically on a fixed, horizontal steel axle, or trunnion, leaving the entire river channel open for shipping. With the front of each leaf counterbalanced by weights at the rear, relatively small motors could open and close the span. Completed in 1904, the West Division Street Bridge was the fourth bascule based on the city's new design.
  • Unprocessed Field note material exists for this structure: N667
  • Survey number: HAER IL-148
  • Building/structure dates: 1904 Demolished
Source https://www.loc.gov/pictures/item/il0828.photos.318468p
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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current15:03, 17 July 2014Thumbnail for version as of 15:03, 17 July 20145,000 × 3,594 (17.14 MB)Fæ (talk | contribs)GWToolset: Creating mediafile for Fæ. HABS 16 July 2014 (1201:1400)

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