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Ancient history – Aggregate of past events from the beginning of recorded human history and extending as far as the Early Middle Ages or the Postclassical Era. The span of recorded history is roughly five thousand years, beginning with the earliest linguistic records in the third millennium BC in Mesopotamia and Egypt .
The 1840s (pronounced "eighteen-forties") was a decade of the Gregorian calendar that began on January 1, 1840, and ended on December 31, 1849. The decade was noted in Europe for featuring the largely unsuccessful Revolutions of 1848 , also known as the Springtime of Nations .
1840: John Herschel invents the blueprint. [422] 1841: Alexander Bain devises a printing telegraph. [423] 1842: William Robert Grove invents the first fuel cell. 1842: John Bennet Lawes invents superphosphate, the first man-made fertilizer. 1844: Friedrich Gottlob Keller and, independently, Charles Fenerty come up with the wood pulp method of ...
1880s: Most Popular Girl Names. Mary. Anna. Emma. Elizabeth. Margaret. Minnie. Ida. Bertha. Clara. Alice. Least popular name: Christina Every John needs a Mary, and this top-spot girl name remains ...
In his 1976 book Keywords: A Vocabulary of Culture and Society, Raymond Williams states in the entry for "Industry": "The idea of a new social order based on major industrial change was clear in Southey and Owen, between 1811 and 1818, and was implicit as early as Blake in the early 1790s and Wordsworth at the turn of the [19th] century."
The Castillo, Chichen Itza, Mexico, ca. 800–900 CE Panel 3 from Cancuen, Guatemala, representing king T'ah 'ak' Cha'an. Large and complex civilizations developed in the center and southern regions of Mexico (with the southern region extending into what is now Central America) in what has come to be known as Mesoamerica.
Prominent leaders included Henry Clay and President James Monroe—who gave his name to Monrovia, the capital of Liberia. However, after 1840 many abolitionists rejected the idea of repatriation to Africa. [34] The abolitionist movement among white Protestants was based on evangelical principles of the Second Great Awakening.
Sandblasting equipment typically consists of a chamber in which sand and air are mixed. The mixture travels through a hand-held nozzle to direct the particles toward the surface or workpiece. Nozzles come in a variety of shapes, sizes, and materials. Boron carbide is a popular material for nozzles because it resists abrasive wear well.