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  2. Agricultural fencing - Wikipedia

    en.wikipedia.org/wiki/Agricultural_fencing

    Woven and mesh wire fencing material has smooth horizontal wires and vertical wires (called stays). Wire spacing and height of fence is dependent on which type of animal is being contained. [9] Agricultural woven wire is identifiable by wire "knots" wrapped around each intersecting wire. Mesh wire material is spot welded at each junction.

  3. Barbed wire - Wikipedia

    en.wikipedia.org/wiki/Barbed_wire

    An example of the costs of fencing with lumber immediately prior to the invention of barbed wire can be found with the first farmers in the Fresno, California, area, who spent nearly $4,000 (equivalent to $102,000 in 2023) to have wood for fencing delivered and erected to protect 2,500 acres (1,000 ha) of wheat crop from free-ranging livestock ...

  4. Fence - Wikipedia

    en.wikipedia.org/wiki/Fence

    A fence is a structure that encloses an area, typically outdoors, and is usually constructed from posts that are connected by boards, wire, rails or netting. [1] A fence differs from a wall in not having a solid foundation along its whole length. [2] Alternatives to fencing include a ditch (sometimes filled with water, forming a moat).

  5. pH meter - Wikipedia

    en.wikipedia.org/wiki/PH_meter

    Beckman Model M pH Meter, 1937 [1] Beckman model 72 pH meter, 1960 781 pH/Ion Meter pH meter by Metrohm. A pH meter is a scientific instrument that measures the hydrogen-ion activity in water-based solutions, indicating its acidity or alkalinity expressed as pH. [2]

  6. Synthetic fence - Wikipedia

    en.wikipedia.org/wiki/Synthetic_fence

    A horse behind a vinyl fence of flexible "rail" and coated wire. A synthetic fence, plastic fence or (when made of vinyl) vinyl or PVC fence is a fence made using synthetic plastics, such as vinyl , polypropylene, [1] nylon, [2] polythene (polyethylene) ASA, or from various recycled plastics. Composites of two or more plastics can also be used ...

  7. Perimeter fence - Wikipedia

    en.wikipedia.org/wiki/Perimeter_fence

    Timber fencing; Palisade fencing; Welded wire mesh fence fencing; Chain-link fencing; Rolled mesh fencing; Metal railings; Vertical bar fencing has been the most popular form of perimeter security fence since the 1980s. Since the 2000s, welded wire mesh and acoustic barriers have also become popular types of perimeter fence around the world.

  8. HuffPost Data

    projects.huffingtonpost.com

    Interactive maps, databases and real-time graphics from The Huffington Post

  9. Glass electrode - Wikipedia

    en.wikipedia.org/wiki/Glass_electrode

    The bottom of a pH electrode balloons out into a round thin glass bulb. The pH electrode is best thought of as a tube within a tube. The inner tube contains an unchanging 1×10 −7 mol/L HCl solution. Also inside the inner tube is the cathode terminus of the reference probe.

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