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Napier's bones is a manually operated calculating device created by John Napier of Merchiston, Scotland for the calculation of products and quotients of numbers. The method was based on lattice multiplication , and also called rabdology , a word invented by Napier.
He also invented the so-called "Napier's bones" and made common the use of the decimal point in arithmetic and mathematics. Napier's birthplace, Merchiston Tower in Edinburgh, is now part of the facilities of Edinburgh Napier University. There is a memorial to him at St Cuthbert's at the west side of Edinburgh. [2]
The promptuary, also known as the card abacus is a calculating machine invented by the 16th-century Scottish mathematician John Napier and described in his book Rabdologiae [1] in which he also described Napier's bones. It is an extension of Napier's Bones, using two sets of rods to achieve multi-digit multiplication without the need to write ...
Genaille–Lucas rulers (also known as Genaille's rods) are an arithmetic tool invented by Henri Genaille, a French railway engineer, in 1891. The device is a variant of Napier's bones . By representing the carry graphically, the user can read off the results of simple multiplication problems directly, with no intermediate mental calculations .
The first of these was entitled Family Feud: 2010 Edition and was released for the Wii, Nintendo DS, and PC in September 2009. [82] Ubisoft then released Family Feud Decades the next year, which featured sets and survey questions from television versions of all four decades the show has been on air. [83]
Although country music pushed back against The Chicks, they sold almost 900,000 tickets in the first weekend of their 2003 tour. Months later, they were declared Billboard’s top-selling country ...
Walker's Point Estate (or the Bush compound) is the summer retreat of the Bush family, in the town of Kennebunkport, Maine. It lies along the Atlantic Ocean in the northeastern United States, on Walker's Point. The estate served as the Summer White House of George H. W. Bush, the 41st president of the United States.
Kircher adopted some of the ideas in the Organum from preexisting inventions like Napier's bones, almanacs, and his own Arca Musarithmica. Like other calculating devices of the period, the Organum prefigures modern computing technology. Yet, due to its general lack of adoption, it remains an interesting but obscure footnote in the history of ...