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Onager with a bowl bucket Sketch of an onager with a sling, a later improvement that increased the length of the throwing arm, from Antique technology by Diels.. The onager (UK: / ˈ ɒ n ə dʒ ə /, / ˈ ɒ n ə ɡ ə /; US: / ˈ ɑː n ə dʒ ə r /) [1] was a Roman torsion-powered siege engine.
Invented in 1952 by Virginia Apgar. Disposable diapers The first disposable diaper was invented in 1946 by Marion Donovan, a professional-turned-housewife who wanted to ensure her children's cloth diapers remained dry while they slept. [12] Donovan patented her design (called 'Boaters') in 1951.
The onager (/ ˈ ɒ n ə dʒ ər /) (Equus hemionus), also known as hemione or Asiatic wild ass, is a species of the family Equidae native to Asia. A member of the subgenus Asinus , the onager was described and given its binomial name by German zoologist Peter Simon Pallas in 1775.
Many countries followed in the 1950s and 1960s, with a peak in 1960 with the Year of Africa, which saw 17 African nations declare independence, including a large part of French West Africa. Most of the remaining countries gained independence throughout the 1960s, although some colonizers (Portugal in particular) were reluctant to relinquish ...
2008, the freeplay fetal heart rate monitor was invented. It is a hand-crank powered diagnostic device. [29] [30] 2013, Amoriguard, a paint whose fillers are based on recycled industrial waste is invented by Professor Mulalo Doyoyo. 2013, Doctor Sandile Ngcobo invented the world's first Digital Laser (Ngcobo, S., Litvin, I., Burger, L. et al.
A Congolese woman asserts women's rights with the message 'The mother is as important as the father' printed on her pagne, 2015.. The culture, evolution, and history of women who were born in, live in, and are from the continent of Africa reflect the evolution and history of the African continent itself.
Mangonel was a general term for medieval stone-throwing artillery and was used more specifically to refer to manually (traction--) powered weapons. It is sometimes wrongly used to refer to the onager. [10] Modern military historians came up with the term "traction trebuchet" to distinguish it from previous torsion machines such as the onager. [11]
For example at the end of the 19th century, Gustav Köhler contended that the petrary was a traction trebuchet, invented by Muslims, whereas the mangonel was a torsion catapult. [ 45 ] John France suggests that different terms for siege engines such as petraria , mangana , mangonella , and tortentum referred to size categories instead. [ 23 ]