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In 1885, French mathematician Édouard Lucas posed an arithmetic problem during a session of the Académie française.Genaille, already known for having invented a number of arithmetic tools, created his rulers in the course of solving the problem.
Signo rodado [] used by Fernando Pérez de Traba [1]. Fernando (or Fernán) Pérez de Traba (Spanish: [feɾˈnando ˈpeɾeθ ðe ˈtɾaβa, feɾˈnam-]; c. 1090 – 1 November 1155), or Fernão Peres de Trava (Portuguese: [fɨɾˈnɐ̃w ˈpeɾɨʒ ðɨ ˈtɾavɐ]), was a nobleman and count of the Kingdom of León who for a time held power over all Galicia.
A neusis construction might be performed by means of a marked ruler that is rotatable around the point P (this may be done by putting a pin into the point P and then pressing the ruler against the pin). In the figure one end of the ruler is marked with a yellow eye with crosshairs: this is the origin of the scale division on the ruler.
2 Great-Sun name unknown c. 455 3 Ruler 3: Ku Ix: c. 465 4 K'altuun Hix, Tuun K'ab' Hix name unknown c. 476 5 Ruler 5: Muyal Jol: c. 485 6 Ruler 6 B'alam Nehn: 504–544 7 Jaguar Mirror; Waterlily-Jaguar Wil Ohl K'inich: 532–551 8 Ruler 8; Head on Earth Sak-Lu: 551–553 9 Ruler 9 Tzi-B'alam: 553–578 10 Moon Jaguar K'ak' Chan Yopaat: 578 ...
2 Jean-Baptiste Le Moyne de Bienville (1680–1767) 1701 1713 3 Antoine de la Mothe Cadillac (1658–1730) 1713 1716 4 Jean-Baptiste Le Moyne de Bienville (1680–1767) 1716 1717 5 Jean-Michel de Lepinay (c. 1665 –1721) 1717 1718 6 Jean-Baptiste Le Moyne de Bienville (1680–1767) 1718 1724 7 Pierre Dugué de Boisbriand (1675–1736) 1724 1726 8
A rolling ruler is a ruler that contains a cylinder much like a rolling pin inside, thereby enabling it to "roll" along a sheet of paper or other surface where it is being used. A rolling ruler can draw straight, parallel lines, and also has other instruments included, enabling it to do the jobs of a protractor and compass. [1] [2]
[2] [3] Alfonso was only five at his father's death (September 999) and he spent the early years of his reign in the care of Menendo and his wife. The earliest act of Alfonso as king dates to 13 October 999, and it lists as confirmants first Count Menendo González (" Menendus Gundisaluiz, comes ") and then "Duke" Sancho García of Castile ...
"Hallan tumba de familia real de Cancuén: Once presuntos familiares de rey habrían sido muertos en Petén en 850 d. C". Prensa Libre (in Spanish). Guatemala: Prensa Libre S.A. OCLC 12565005. Archived from the original (online edition) on 2008-04-16; Skidmore, Joel (2005-11-19). "Cancuen in the News". Mesoweb Reports and News.