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The drawing on the upper right shows a moiré pattern. The lines could represent fibers in moiré silk, or lines drawn on paper or on a computer screen. The nonlinear interaction of the optical patterns of lines creates a real and visible pattern of roughly parallel dark and light bands, the moiré pattern, superimposed on the lines. [4]
Chain-link fencing showing the diamond patterning A chain-link fence bordering a residential property. A chain-link fence (also referred to as wire netting, wire-mesh fence, chain-wire fence, cyclone fence, hurricane fence, or diamond-mesh fence) is a type of woven fence usually made from galvanized or linear low-density polyethylene-coated steel wire.
In 1930, Mafera filed an application for a "method of forming wire fence fabric", which was approved in 1931. [1] Mafera's brother already owned a chain-link fence company in Medford, Massachusetts, [2] and Mafera's 1931 patent was one of the several advancements made by the Maferas in the development of chain-link fencing.
The purpose of perimeter fence is to stop or prevent the incident and reduce the level of risk. Doing so discourages the perpetrator from completing a harmful event. For example, a high wall with fence posts that protects a property discourages criminals from intruding and, when an incident occurs, increases the time it takes to carry it out.
Chain link fence with barbed wire on top Razor wire is a curved variation of barbed wire. Most barbed wire fences, while sufficient to discourage cattle, are passable by humans who can simply climb over or through the fence by stretching the gaps between the wires using non-barbed sections of the wire as handholds.
Chain link fence with barbed wire on top. Detail of barbed wire. The Industrial Revolution brought the first barbed wire (also "barbwire" or just "barb") fences, which were widely used after their introduction in the mid-19th century. This technology made it economically feasible to fence rangeland for the first time.