File OlorgesailieLandscape1993.jpg thumb Landscape near OlorgesailieOlorgesailie is a geological formation in East Africa containing a group of Lower Paleolithic Archeology archaeological sites. r Aboutdotcom It is on the floor of the Eastern Rift Valley in southern Kenya , convert 40 mi km southwest of Nairobi along the road to Lake Magadi . Olorgesailie is noted for the large number of Acheulean hand axe s, associated with animal butchering, discovered there. r Aboutdotcom According to the National Museums of Kenya , the finds are internationally significant for archaeology, paleontology , and geology. r Kenyamuseums History File Olorgesailie axes.jpg left thumb upright Hand axes The Artifact archaeology artifacts were first discovered by the British geologist John Walter Gregory in 1919, r DailyNation r Willo but it was not until 1943 that excavation began in earnest under the direction of Mary Leakey Mary and Louis Leakey , with the assistance of Parole Prisoners of war paroled Italian Prisoner of war prisoners of war . r Nicho Work continued there until 1947. Glynn Isaac took up ... File Olorgesailie fossils.jpg upright thumb Animal fossils from Olorgesailie Human tools are the most ... in the Olorgesailie basin. Subsequent earth movements made the stratigraphy and fossils ... archaeology.about.com od oterms qt olorgesailie.htm title Olorgesailie Stone Age Site in Kenya publisher ... 1216 465244 c2enrbz index.html title So much to see at Olorgesailie publisher Daily Nation date ... content blogcategory 34 60 title Olorgesailie publisher National Museums of Kenya accessdate March 1, 2009 ref Olorgesailie is now a Kenyan national site. ref name Kenyamuseums ref name Natur ... Increased age estimate for the Lower Palaeolithic hominid site at Olorgesailie, Kenya publisher ... 01 Rick Potts.pdf title First Human Fossil Found at Olorgesailie Kenya Field Site Smithsonian Scientist ... Bibliography Cite book author Isaac, Glynn Llywelyn Isaac, Barbara authorlink coauthors title Olorgesailie ... more details
. In 1942 the archaeologist Mary Leakey discovered prehistoric human artefacts at Olorgesailie , a lower ... the Olorgesailie site and the area between Olorgesailie and Ngong, Kenya Ngong . Shackleton returned ... more details
social organization. Works The Archaeology of Human Origins , Cambridge University Press. Olorgesailie ... Olorgesailie Koobi Fora David Pilbeam External links http www.mnsu.edu emuseum information biography ... more details
Africa n sites, such as Chesowanja near Lake Baringo , Koobi Fora , and Olorgesailie in Kenya , show ... at a site in Olorgesailie, Kenya. Some microscopic charcoal was found, but it could have resulted ... more details
File Wedge 1.jpg thumb A wood splitting wedge references have been corrected Refimprove date June 2009 A wedge is a triangle triangular shaped round tool, a compound and portable inclined plane , and one of the six classical simple machine s. It can be used to separate two objects or portions of an object, lift an object, or hold an object in place. It functions by converting a force applied to its blunt end into forces perpendicular Surface normal normal to its inclined surfaces. this link is broken ref Citation title Wedges and screws url http em ntserver.unl.edu Negahban em223 note16 note16.htm accessdate 2009 07 29 . ref The mechanical advantage of a wedge is given by the ratio of the length of its slope to its width. ref name bowser Citation last Bowser first Edward Albert title An elementary treatise on analytic mechanics with numerous examples publisher D. Van Nostrand Company pages 202 203 year 1920 edition 25th url http books.google.com ?id mE4GAQAAIAAJ . ref ref name CEST McGraw Hill Concise Encyclopedia of Science & Technology , Third Ed., Sybil P. Parker, ed., McGraw Hill, Inc., 1992, p. 2041. ref Although a short wedge with a wide angle may do a job faster, it requires more force than a long wedge with a narrow angle. History Image Flint hand axe.JPG thumb left 120px Flint hand axe found in Winchester Perhaps the first example of a wedge is the hand axe, also see biface and Olorgesailie . A hand axe is made by chipping stone, generally flint, to form a bifacial edge, or wedge. A wedge is a simple machine that transforms lateral force and movement of the tool into a transverse splitting force and movement of the workpiece. The available power is limited by the effort of the person using the tool, but because power is the product of force and movement, the wedge amplifies the force by reducing the movement. This amplification, or mechanical advantage is the ratio of the input speed to output speed. For a wedge this is given by 1 tan , where is the tip a ... more details
Melka Kuntur in Ethiopia , Olorgesailie in Kenya, Isimila in Tanzania and Kalambo Falls in Zambia ... handaxe from Olorgesailie , Current Anthropology 22 76 9. See also William H. Calvin Calvin ... more details
Encyclopedia
top
