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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 ...
Scotsman John Napier reinvented a form of logarithms and an ingenious system of movable rods (1617, referred to as Napier's Rods or Napier's bones). These rods were based on the lattice or gelosia multiplication algorithm and allowed the operator to multiply, divide, and calculate square and cube roots by moving the rods around and placing them ...
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 .
Napier's Bones, a multiplication device invented by John Napier (who dies on April 4), is described in his Rabdologiæ, published in Edinburgh. Henry Briggs publishes Logarithmorum Chilias Prima , a modification of Napier's logarithms into common logarithms .
Napier's bones – John Napier; Newcomen steam engine – Thomas Newcomen; Newtonian telescope – Isaac Newton; Newton's Cradle – Isaac Newton; Nissen hut – Peter Norman Nissen; Nordenfelt gun – Thorsten Nordenfelt; Northrop Loom – James Henry Northrop; Odhner Arithmometer – Willgodt Theophil Odhner [24] Odón device – Jorge Odón [25]
The Bush family is an American political family that has played a prominent role in American politics since the 1950s, foremost as the first family of the United States from 1989 to 1993 and again from 2001 to 2009, during the respective presidencies of George H.W. Bush and George W. Bush. They also played prominent roles in areas of American ...