Barrier Fencing
barrier fencing erected to exclude or confine people or animals, defining boundaries, or just to decorate. Timber, earth, stone, and metal are widely used for fencing. In old days, living plants are used as fences and have been made in lots of places, such as the hedges of Great Britain and continental Europe and the cactus fences of Latin America. In well-timbered country, such as colonial and 19th-century North America, many patterns of timber fence were developed, such as the split rail laid zigzag, the post rail, and the picket. On the East European Plain and in the western United States, fences of turf were erected that often stood for years in the absence of heavy rains.
In mid-19th century wire has been used as fencing material, with the growing development of methods of production came up woven wire fences, affixed to wood, steel or concrete post, proved economical durable, the invention of barbed wire in 1860’s and its machine used for manufacturing in 1874 made possible effective fencing of all sorts.
Electrified fences, frequently a single strand of barbed wire, are sometimes used for temporary confinement of animals. A mild shock is given to the animal at intervals of a few seconds if it is in contact with the fence.