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  • USS Wando (AT-17)


    The second USS Wando (Tug No. 17), later YT-17, later YT-123, later YTB-123, was a United States Navy tug in commission from 1917 to 1946.

  • Kayak


    Whitewater kayaker at Great Falls, Virginia, United States|alt=Man wearing helmet sitting in fiberglass boat, paddling through frothy water A kayak is a small, narrow watercraft which is propelled by means of a double-bladed paddle. The word kayak originates from the Greenlandic word qajaq (). The traditional kayak has a covered deck and one or more cockpits, each seating one paddler. The cockpit is sometimes covered by a spray deck that prevents the entry of water from waves or spray, differentiating the craft from a canoe. The spray deck makes it possible for suitably skilled kayakers to roll the kayak: that is, to capsize and right it without it filling with water or ejecting the paddler. Inuit seal hunter in a kayak, armed with a harpoon|alt=Man sitting with legs covered in boat that tapers to a point at each end holding long, pointed, wooden pole Interior 360 degree photosphere of a kayak at the Smithsonian National Museum of the American Indian.

  • Swing bridge


    A swing bridge is a movable bridge that has as its primary structural support a vertical locating pin and support ring, usually at or near to its center of gravity, about which the turning span can then pivot horizontally as shown in the animated illustration to the right. Small swing bridges as found over canals may be pivoted only at one end, opening as would a gate, but require substantial underground structure to support the pivot. In its closed position, a swing bridge carrying a road or railway over a river or canal, for example, allows traffic to cross. When a water vessel needs to pass the bridge, road traffic is stopped (usually by traffic signals and barriers), and then motors rotate the bridge horizontally about its pivot point. The typical swing bridge will rotate approximately 90 degrees, or one-quarter turn; however, a bridge which intersects the navigation channel at an oblique angle may be built to rotate only 45 degrees, or one-eighth turn, in order to clear the channel.

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