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Upper Peninsula Regional Digitization Center

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  • All fields: Unit
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Display: 20

    • Catwalk

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • The windless used to pull the mesh along the cables in sitting ""on the deck"". This self-powered unit pulled the mesh out and tightened it up so it could be secured. This unit was powered by its own gas engine.
    • Engine on parade

    • Transportation, Railroads, Copper Country
    • Reconditioned steam tank engine no. 5649 built by H. K. Porter of Pittsburgh, PA for a Calumet and Hecla smelter in the Copper Country. Unit later became no. 3 of the DSS&A Railroad. Engine was loaded on truck and shown off in a local parade after...
    • Tower caisson

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • Engineers inspect as crewmen work on the assembly of the tower caisson rings. They are standing on ring 8-20. This is ring number eight of the twenty in the finished unit.
    • Tower caisson

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • Engineers inspect as crewmen work on the assembly of the tower caisson rings. They are standing on ring 8-20. This is ring number eight of the twenty in the finished unit.
    • Tower caisson

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • This completed first section of a tower caisson (No. 20) is ready to take the trip to the bridge 90 miles away. The unit was built on the beach. The crane had to dredge a channel so the caisson could be towed off the beach and into Lake Huron for...

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