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Upper Peninsula Regional Digitization Center

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  • All fields: mass
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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...
    • 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...
    • Busy place

    • Railroads ; Duluth, South Shore, and Atlantic Railway Company
    • Source: The Mining Journal
      Marquette, Mi
      September 17, 1887

      A Busy Place

      First, Jacobs & Co.'s quarry at south Marquette is about the busiest place in the city now. Over a hundred men are employed in or about the quarry and...
    • St. Ignace - at 11 o'clock

    • Railroads ; Duluth, South Shore, and Atlantic Railway Company

    • Source: Newberry News
      Newberry, Luce County, Mi.
      May 3, 1888
      Thursday

      St. Ignace - At 11 o'clock this morning an alarm of fire was sounded by one of the yard engines and in a few moments it begame [*became] generally known that...

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