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2. Lifting beam - Wikipedia

   en.wikipedia.org/wiki/Lifting_beam

   The lifting beam (also known as traverse, spreader beam) is a steel beam that is attached to the hook of the crane in order to spread the slings from one end of an elongated load (like a wall panel) to another. The bottom of the beam has multiple connection points for hanging the load. [1] H-shaped traverse

3. Four-bar linkage - Wikipedia

   en.wikipedia.org/wiki/Four-bar_linkage

   It consists of four bodies, called bars or links, connected in a loop by four joints. Generally, the joints are configured so the links move in parallel planes, and the assembly is called a planar four-bar linkage. Spherical and spatial four-bar linkages also exist and are used in practice. [1] A pumpjack's main mechanism is a four-bar linkage

4. Container spreader - Wikipedia

   en.wikipedia.org/wiki/Container_spreader

   A container spreader is a tool used for lifting containers and unitized cargo. The spreader is placed between the container and the lifting machine. [1]The spreader used for containers has a locking mechanism at each corner that attaches to the four corners of the container.

5. Spreader - Wikipedia

   en.wikipedia.org/wiki/Spreader

   Spreader (sailboat), a spar on a sailboat used to deflect the shrouds to allow them to better support the mast; Spreader bar, a BDSM bondage device; Spreader beam, a lifting device used to distribute forces appropriately for structural or interference reasons; Container spreader, a tool used for lifting containers and unitized cargo

6. Rigging (material handling) - Wikipedia

   en.wikipedia.org/wiki/Rigging_(material_handling)

   Rigging is the equipment such as wire rope, turnbuckles, clevis, jacks used with cranes and other lifting equipment [1] in material handling and structure relocation. Rigging systems commonly include shackles, master links and slings, and lifting bags in underwater lifting.

7. Airy points - Wikipedia

   en.wikipedia.org/wiki/Airy_points

   For example, a 1000 mm length gauge would have an Airy point separation of 577.4 mm. A line or pair of lines would be marked onto the gauge 211.3 mm in from each end. Supporting the artifact at these points ensures that the calibrated length is preserved. Airy's 1845 paper [1] derives the equation for n equally spaced support points. In this ...