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1. 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
2. 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
3. Aerial Bridge: Entrance To Duluth-Superior Harbor, Duluth, Minnesota
- Date Created:
- 1906?
- Description:
- The post card caption says The Aerial Bridge, Span 393 feet 9 inches, 135 feet high from water line. Cost $100,000. This post card illustration is of a view from the Duluth harbor with the U.S. Army Corps of Engineers Building at the left and the South Breakwater Inner Light Tower at the right. Houses on Minnesota Point are at the far right. Engineer C.A.P. Turner, of the Gillette-Herzog Manufacturing Company of Minneapolis, designed the Ferry Bridge with Suspended Car Transfer in February 1901, meeting federal specifications. Bids were opened March 25, 1901, but only one was received. The Duluth Canal Bridge Company was awarded the contract but abandoned the work. In February, 1904, the Modern Steel Structural Company of Waukesha, Wisconsin was issued a contract. Work began July 20, 1904. The aerial bridge transporter or gondola or transfer car roadway was 17 feet by 50 feet with sidewalks seven feet by 50 feet; the cabins were 30 feet long.
- Contributing Institution:
- University of Minnesota Duluth, Kathryn A. Martin Library, Northeast Minnesota Historical Collections
- Type:
- Still Image
- Format:
- Postcards
4. Aerial Bridge Duluth, Minnesota
- Date Created:
- 1906?
- Description:
- The post card caption says The Aerial Bridge, Span 393 feet 9 inches, 135 feet high from water line. Cost $100,000. This post card illustration is of a view from the waterfront. At the right is the South Breakwater Inner Light Tower. Houses on Minnesota Point are at the far right. Engineer C.A.P. Turner, of the Gillette-Herzog Manufacturing Company of Minneapolis, designed the Ferry Bridge with Suspended Car Transfer in February 1901, meeting federal specifications. Bids were opened March 25, 1901, but only one was received. The Duluth Canal Bridge Company was awarded the contract but abandoned the work. In February, 1904, the Modern Steel Structural Company of Waukesha, Wisconsin was issued a contract. Work began July 20, 1904.
- Contributing Institution:
- University of Minnesota Duluth, Kathryn A. Martin Library, Northeast Minnesota Historical Collections
- Type:
- Still Image
- Format:
- Postcards
5. Aerial Bridge: Aerial Bridge Over Duluth-Superior Ship Canal, Duluth, Minnesota
- Date Created:
- 1915?
- Description:
- The suspended car transfer was replaced in 1929 with the Aerial Lift Bridge span. The building at the left is the wholesale grocer Gowan Lenning Twohy.
- Contributing Institution:
- University of Minnesota Duluth, Kathryn A. Martin Library, Northeast Minnesota Historical Collections
- Type:
- Still Image
- Format:
- Postcards
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