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You searched for: Contributor University of Minnesota Duluth, Kathryn A. Martin Library, NEMHC Collections Remove constraint Contributor: University of Minnesota Duluth, Kathryn A. Martin Library, NEMHC Collections Subject Headings Bridges Minnesota Remove constraint Subject Headings: Bridges Minnesota Subject Headings Movable Bridges Remove constraint Subject Headings: Movable Bridges Physical Format Design drawings Remove constraint Physical Format: Design drawings Topic Architecture Remove constraint Topic: Architecture
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1. Aerial Bridge: Strain Diagram, Duluth, Minnesota

Date Created:
1903?
Description:
This drawing identifies wind forces and their effects on the physical structure. Notes are included on this drawing for example: "Stresses in lower sections of tension diagonals equal or smaller than top sections, but same riveting to be used in detail." The drawing includes a key for live load, dead load, impact, wind at 150 pounds per linear foot, wind stress due to traveler, equivalent to live load. The drawing shows top and bottom laterals. Total weight of the carrier and car is given as 240,000 pounds. The scale is given as 20 feet equaling one inch. Drawing H5421, Sheet 3.
Contributing Institution:
University of Minnesota Duluth, Kathryn A. Martin Library, Northeast Minnesota Historical Collections
Type:
Still Image
Format:
Design drawings

2. Aerial Bridge: Structural Details, End View, Part Side Elevation, Duluth, Minnesota

Date Created:
1903?
Description:
Detailed drawing of four parts of the Aerial Bridge. The end view is a drawing of a tower; part side elevation is of half of the Aerial Bridge with the suspended car transfer. The third drawing is called Section A-A and depicts a tower without the cross structures drawn in. The last drawing is called Section B-B, which is a top down view of one of the towers resting on its footings. All of these drawings have dimensions. The part side elevation includes a very small drawing of the side of the gondola car. The end view includes the phrase "car approaches built by city." The finials are shown on three of the four drawings. Drawing H5421, Sheet 2.
Contributing Institution:
University of Minnesota Duluth, Kathryn A. Martin Library, Northeast Minnesota Historical Collections
Type:
Still Image
Format:
Design drawings

3. Aerial Lift Bridge: Lake Avenue South Bridge Over Duluth Ship Canal for the City of Duluth, Minnesota

Creator:
Harrington Howard and Ash Consulting Engineers
Date Created:
1929-03-20
Description:
Set of 37 sheets of architectural drawings accepted for the City of Duluth by Samuel F. Snively, Mayor, and John Wilson, City Engineer, Plans Accompanying Specifications of January 1929. Technical drawings with varying degrees of legibility. There is only one elevation in the set; Sheet 1. The original bridge was the Aerial Bridge constructed in 1904-1905. The bridge was modified in 1929 with a lift span and subsequently called the Aerial Lift Bridge. These plans are highly technical and were designed for the use of engineers and specialty contractors. Each drawing indicates that certain features of the structure have been revised. This set appears to represent the final revision. The Lift Bridge was designed by Harrington, Howard and Ash Consulting Engineers, Kansas City and New York. Patented in the United States from 1909-1925.
Contributing Institution:
University of Minnesota Duluth, Kathryn A. Martin Library, Northeast Minnesota Historical Collections
Type:
Still Image
Format:
Design drawings
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