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  2. Stuffing box - Wikipedia

    en.wikipedia.org/wiki/Stuffing_box

    The stuffing box prevents water from entering the boat's hull. In many small fiberglass boats, for example, the stuffing box is mounted inboard near the point the shaft exits the hull . The "box" is a cylindrical assembly, typically of bronze, comprising a sleeve threaded on one end to accept adjusting and locking nuts.

  3. Lake freighter - Wikipedia

    en.wikipedia.org/wiki/Lake_freighter

    Destination harbors, ship sizes, and legal restrictions greatly affect the pattern of haulage. Large U.S. ships hauled most of the iron ore on the lakes (79%) from U.S. mines to U.S. mills. This reflects the requirement of the Jones Act, as well as the industry using large volumes of material while being concentrated in a few large harbor ...

  4. List of World War II vessel types of the United States

    en.wikipedia.org/wiki/List_of_World_War_II...

    FM 55-130 Small Boats and Harbor Craft [24] Harbor Vessels. The Harbor Craft Company is organized for the purpose of ferrying to shore cargo from freighters and transports arriving in theaters of operation. The vessels may either be riding offshore at anchor in the open sea or more likely, anchored in a harbor.

  5. Weeks 533 - Wikipedia

    en.wikipedia.org/wiki/Weeks_533

    The floating barge-crane, originally named Marine Boss, was built for Murphy Pacific Marine.The barge was assembled by Zidell Explorations from scrapped ship steel in Oregon [2] in 1966 and fitted in San Francisco with a heavy 500-ton revolving crane made by Clyde Iron Works [3] to perform the heavy girder and deck-section lifts for construction of the 1967 San Mateo-Hayward Bridge.

  6. Natick-class tugboat - Wikipedia

    en.wikipedia.org/wiki/Natick-class_tugboat

    The Natick class is a class of harbor tugboats that have been active since the 1960s. Members of the class are named for Native American peoples and their members, [ 1 ] USS Redwing excepted. As of 1 April 2015 [update] , five [ 2 ] to eight Natick -class tugs remain in active service.

  7. Breakwater (structure) - Wikipedia

    en.wikipedia.org/wiki/Breakwater_(structure)

    Barra da Tijuca – Rio de Janeiro. Breakwaters reduce the intensity of wave action in inshore waters and thereby provide safe harbourage. Breakwaters may also be small structures designed to protect a gently sloping beach to reduce coastal erosion; they are placed 100–300 feet (30–90 m) offshore in relatively shallow water.

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