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Upper Peninsula Regional Digitization Center

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    • Anchor pier

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • This photo shows the aggregate is above the surface of the surrounding water and the two inch reinforcing bar (rebar) is above the aggregate ready for the next course after grouting is completed below. The future superstructure will be added here...
    • Gismo

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • Driving H-beams as an angle is a tough job. The ""gismo"" made this demanding job go quite well. The ""gismo"" was an adaptation of a steam pile driver that could operate at pre set angles and drive the pile right to the bottom of the cofferdam,...
    • Telegram

    • Railroads ; Duluth, South Shore, and Atlantic Railway Company
    • THE GREAT NORTH WESTERN TELEGRAPH COMPANY OF CANADA

      TELEGRAM

      W. C. Vanhorne

      From Detroit, Mi.

      Shall we arrange to purchase cars for through freight business from Duluth our people think we ought to buy fifteen thousands...

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