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History. Self-leveling concrete was invented in 1952 by Axel Karlsson from Sweden. The first product was a combination of wood glue, fine sand and cement with additives. [1] It was called flytspackel, which directly translates to "floating putty". The term self-leveling can be traced back to a patent applied by the company Lafarge in 1997. [2]
Carpentry includes such specialties as barrelmaker, cabinetmaker, framer, luthier, and ship's carpenter. Carpenter handling a plank used in scaffolding. Exhibit of traditional European carpenter's tools in Italy. Carpenters in an Indian village working with hand tools. Carpentry is a skilled trade and a craft in which the primary work performed ...
Tessellation in two dimensions, also called planar tiling, is a topic in geometry that studies how shapes, known as tiles, can be arranged to fill a plane without any gaps, according to a given set of rules. These rules can be varied. Common ones are that there must be no gaps between tiles, and that no corner of one tile can lie along the edge ...
The two major advantages of formwork systems, compared to traditional timber formwork, are speed of construction (modular systems pin, clip, or screw together quickly) and lower life-cycle costs (barring major force, the frame is almost indestructible, while the covering if made of wood; may have to be replaced after a few - or a few dozen ...
Like one Pekingese, who was on a strict schedule to make a "sock delivery" to his owner and wouldn't take no when his owner "rejected" his delivery. Someone called the United States Postal Office ...
Order-5 120-cell honeycomb. Order-5 dodecahedral honeycomb. Order-5 pentagonal tiling. Order-6 hexagonal tiling. Order-6 hexagonal tiling honeycomb. Order-7 heptagonal tiling. Order-8 octagonal tiling.
Concrete leveling. In civil engineering, concrete leveling is a procedure that attempts to correct an uneven concrete surface by altering the foundation that the surface sits upon. It is a cheaper alternative to having replacement concrete poured and is commonly performed at small businesses and private homes as well as at factories, warehouses ...
Woodcut. The Four Horsemen c. 1496–98 by Albrecht Dürer, depicting the Four Horsemen of the Apocalypse. Woodcut is a relief printing technique in printmaking. An artist carves an image into the surface of a block of wood—typically with gouges —leaving the printing parts level with the surface while removing the non-printing parts.