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U.S. patent 147,756 – Isaac Ellwood, DeKalb, Illinois Improvement in Barbed Fences – "single piece of metal with four points, attached to a flat rail" (February, 1874) U.S. patent 157,124 – Joseph Glidden, DeKalb, Illinois, Improvement in Wire-fences – twisted fence wires with short spur coiled around one of the strands (November, 1874 ...
Charpy test sample with a notch. In mechanical engineering and materials science, a notch refers to a V-shaped, U-shaped, or semi-circular defect deliberately introduced into a planar material. In structural components, a notch causes a stress concentration which can result in the initiation and growth of fatigue cracks.
A steel fence post, also called (depending on design or country) a T-post, a Y-post, or variants on star post, is a type of fence post or picket. They are made of steel and are sometimes manufactured using durable rail steel. They can be used to support various types of wire or wire mesh.
Simple split-rail fence Log fence with double posts (photo taken in 1938). A split-rail fence, log fence, or buck-and-rail fence (also historically known as a Virginia, zigzag, worm, snake or snake-rail fence due to its meandering layout) is a type of fence constructed in the United States and Canada, and is made out of timber logs, usually split lengthwise into rails and typically used for ...
A notch weir is any weir where the physical barrier is significantly higher than the water level except for a specific notch (often V-shaped) cut into the panel. At times of normal flow all the water must pass through the notch, simplifying flow volume calculations, and at times of flood the water level can rise and submerge the weir without ...
A so-called 'chain link fence attenuator' was exposed to impacts by blocks freely rolling down a slope for evaluating its efficiency. These experiments were followed by some others till the end of the 1990s. Progressively, the testing technique was improved using zip-lines to convey the rock block to the barrier.
In 1929, Weir merged Weirton Steel with Detroit's Michigan Steel and Cleveland's M. A. Hanna Company to form National Steel Corporation. National Steel became one of the largest steel producers in the United States, [citation needed] but by the end of the century, the company was experiencing financial difficulties.
Silt fence installed on a construction site. Silt fences are often installed as perimeter controls. They are typically used in combination with sediment basins and sediment traps, as well as with erosion controls, which are designed to retain sediment in place where soil is being disturbed by construction processes (i.e., land grading and other earthworks).
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