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2. Shelf (storage) - Wikipedia

   en.wikipedia.org/wiki/Shelf_(storage)

   Shelf (storage) A shelf ( pl.: shelves) [1] is a flat, horizontal plane used for items that are displayed or stored in a home, business, store, or elsewhere. It is raised off the floor and often anchored to a wall, supported on its shorter length sides by brackets, or otherwise anchored to cabinetry by brackets, dowels, screws, or nails.

3. Sphere packing - Wikipedia

   en.wikipedia.org/wiki/Sphere_packing

   Sphere packing finds practical application in the stacking of . In geometry, a sphere packing is an arrangement of non-overlapping spheres within a containing space. The spheres considered are usually all of identical size, and the space is usually three- dimensional Euclidean space. However, sphere packing problems can be generalised to ...

4. Close-packing of equal spheres - Wikipedia

   en.wikipedia.org/wiki/Close-packing_of_equal_spheres

   Close-packing of equal spheres. In geometry, close-packing of equal spheres is a dense arrangement of congruent spheres in an infinite, regular arrangement (or lattice ). Carl Friedrich Gauss proved that the highest average density – that is, the greatest fraction of space occupied by spheres – that can be achieved by a lattice packing is.

5. Wire shelving - Wikipedia

   en.wikipedia.org/wiki/Wire_shelving

   Wire shelving for industrial use consists of steel wire, used for the decking, and steel sheets, used for the supports. The wire makes up about 60% of the weight and the sheet steel about 40%. Coiled steel wire is cut to the correct lengths required using straight-cut machines. Then, these individual wires are fed through a welding machine that ...

6. Block-stacking problem - Wikipedia

   en.wikipedia.org/wiki/Block-stacking_problem

   The block-stacking problem is the following puzzle: Place identical rigid rectangular blocks in a stable stack on a table edge in such a way as to maximize the overhang. Paterson et al. (2007) provide a long list of references on this problem going back to mechanics texts from the middle of the 19th century.

7. Double-stack rail transport - Wikipedia

   en.wikipedia.org/wiki/Double-stack_rail_transport

   Double-stack rail transport. A container train passing through Jacksonville, Florida, with 53 ft (16.15 m) containers used for shipments within North America. Double-stack rail transport is a form of intermodal freight transport in which railroad cars carry two layers of intermodal containers. Invented in the United States in 1984, it is now ...