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Washboarding effect on a road. Washboarding or corrugation [1] is the formation of periodic, transverse ripples in the surface of gravel and dirt roads.Washboarding occurs in dry, granular road material [2] with repeated traffic, traveling at speeds above 8.0 kilometres per hour (5 mph). [3]
Woman on an Israeli kibbutz using a washboard to do laundry. A washboard or a scrubbing-board [1] is a tool designed for hand washing clothing. With mechanized cleaning of clothing becoming more common by the end of the 20th century, the washboard has become better known for its secondary use as a musical instrument.
The Via Regia (king's road) is a medieval road that ran from Frankfurt am Main to Görlitz in Lower Silesia, in what is today south-west Poland. See also the Via Regia Lusatiae Superioris . An important medieval German pilgrim route was the Via Tolosana (because the most important town along the way is Toulouse , France).
Washboard may refer to: Washboard (laundry), a tool for washing clothes; Washboard (musical instrument), a percussion instrument; Washboarding, corrugation on gravel ...
A recent analysis of fossils belonging to Homo floresiensis found at the Mata Menge site on Flores supports the idea that the hobbits were a dwarfed version of the extinct species Homo erectus.
[17] [18] After significant road construction undertaken by the kingdom of Dahomey, toll roads were established with the function of collecting yearly taxes based on the goods carried by the people of Dahomey and their occupation. [19] The Royal Road was built in the late 18th century by King Kpengla which stretched from Abomey through Cana up ...
Map of early human migrations based on the Out of Africa theory; figures are in thousands of years ago (kya). [1]The peopling of the Americas began when Paleolithic hunter-gatherers (Paleo-Indians) entered North America from the North Asian Mammoth steppe via the Beringia land bridge, which had formed between northeastern Siberia and western Alaska due to the lowering of sea level during the ...
With the development of motor transport, starting in 1886 in Germany and in the U.S. in 1908 with the production of Ford's first Model T, [2] there was an increased need for hard-topped roads to reduce washaways, bogging and dust on both urban and rural roads, originally using cobblestones and wooden paving in major western cities and in the ...