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The term Jacob's ladder, [1] used on a ship, applies to two kinds of rope ladders. [2] The first is a flexible hanging ladder. It consists of vertical ropes or chains supporting horizontal, historically round and wooden, rungs. Today, flat runged flexible ladders are also called Jacob's ladders. The name is commonly used without the apostrophe ...
Execution of Mary Surratt, Lewis Powell, David Herold, and George Atzerodt on July 7, 1865, after trapdoor has been sprung, at Fort McNair, in Washington. A gallows (or less precisely scaffold) is a frame or elevated beam, typically wooden, from which objects can be suspended or "weighed". Gallows were thus widely used to suspend public ...
Ladderback chairs tend to have tall backs with two uprights. Between these two uprights exists multiple horizontal spindles or slats (three in the picture to the right). The seat can be made of a variety of different materials. Originally the majority of seats were constructed using cane or rush, whereas now, the seats tend to be made of wood.
A box crib is the simplest, most stable and most common method of cribbing. It is constructed by arranging sets (two or more) of matched blocks in a regular log-cabin style to form a rising square or rectangular frame. The more blocks on each level, the greater the number of support points and therefore the greater the strength of the crib tower.
Wood pilings grouped into a pair of dolphins serving as a protected entryway to a boat basin. A dolphin is a group of pilings arrayed together to serve variously as a protective hardpoint along a dock, in a waterway, or along a shore; as a means or point of stabilization of a dock, bridge, or similar structure; as a mooring point; and as a base for navigational aids.
Boat building is the design and construction of boats (instead of the larger ships) — and their on-board systems. This includes at minimum the construction of a hull, with any necessary propulsion, mechanical, navigation, safety and other service systems as the craft requires. [ 1]
A cantilever in a traditionally timber framed building is called a jetty or forebay. In the southern United States, a historic barn type is the cantilever barn of log construction . Temporary cantilevers are often used in construction. The partially constructed structure creates a cantilever, but the completed structure does not act as a ...
A cargo hatch or deck hatch or hatchway is type of door used on ships and boats to cover the opening to the cargo hold or other lower part of the ship. To make the cargo hold waterproof, most cargo holds have cargo hatch. This can be a waterproof door, like a trap door with hinges or a cover that is places on top of the cargo hold opening ...
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