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Upper Peninsula Regional Digitization Center

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    • Concrete at the anchor pier

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • Concrete is placed in the lower areas of the anchor piers using tremmies (elephant trunk). This is a hopper/funnel device with a hose attached used to place materials where desired by gravity. Once these areas had served their purpose they were...
    • Roadway progress

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • This photo shows the components for the roadway being worked on. Shown here are the center mall (median), two feet wide & four inches high. The center driving lane of open grid, eleven feet wide. The outer lanes are of open mesh, twelve feet...
    • Tower caisson

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • Construction of the first section of a tower caisson. Note the wedge shaped cutting edge. These sections were fabricated in Gary, Indiana and shipped to Rockport (Alpena), MI by barge where they were assembled by Wiltse Brothers Shipyard. This...
    • Tower caisson

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • Photo shows the cutting edge of the tower caisson No. 19 during fabrication at Alpena, MI. Designed to work like a cookie cutter this caisson is filled with aggregate in the double wall area which acts as weight to drive it through the...
    • New cars

    • Railroads ; Duluth, South Shore, and Atlantic Railway Company
    • Source: The Mining Journal
      Marquette, Mi.
      August 11, 1888
      Saturday

      New Cars

      One hundred of the new box cars ordered by The DSS&A a few months ago have been delivered to the road and have all ready been put to use. The first...
    • New passenger engines

    • Railroads ; Duluth, South Shore, and Atlantic Railway Company
    • Source: The Mining Journal
      Marquette, Mi.
      August 25, 1888
      Saturday

      The New Passenger Engines

      One, No. 102, of the two new Baldwin passenger engines which were received by the DSS&A a few days ago has been set up and...

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