NEW!! New Napier Bones Collectors Set with Silk Screened Numbers & Letters. New Case with Index rod and Base attached to the tray for working the bones. Now with Square Root and Cube Root Bones. All in a Beautiful Wood Case with Dove Tailed sliding door, cases are made in 1600 format and will have some slight blemishes to resemble the 1600 century construction. New Sets will have Upgraded Bones with Opposite Sides always totaling 9 (this is the desired method of the Original Bones) This Beautiful Collectors Set of John Napier Bones and Rods (1617 A.D.) comes with very Rare 'copy' of Napier's Bones History and Instruction Manual.

- Complete Set with 10 'bones' opposite sides totalling 9

- New set includes Square and Cube Root bone

- Bones stack on calculation tray for use

- All Napiers Bones components fit in wood case

- Comes with instructions on how to use Napiers Bones

- Case Dims are 6.5" x 8" x 1 1/4 "

- Bones or Rods Dims are 1/2" x 1/2" x 5 1/4"

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See Below Pictures for more Valuable Information
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John Napier

Born: 1550 in Merchiston Castle, Edinburgh, Scotland

Died: 4 April 1617 in Edinburgh, Scotland
Brief History
In the early 1600s, a Scottish mathematician called John Napier, the inventor of logarithms, also invented a tool called Napier's Bones. John Napier's rods (1617) (Napier Rechenstäbchen), also known as Napier's bones, were one of his most important contributions to the world of mathematics.

What are Napiers Bones?
The rods were basically multiplication tables inscribed on sticks of wood or bone. More advanced use of the rods can even be used to extract square roots and cube roots.

The surface of the rod is divided into 9 squares, and each square, except for the top one, is divided into two halves by a diagonal line. In the first square of each rod a single-digit number is written, and the other squares are filled with double, triple, quadruple and so on until the last square contains nine times the number written in the top square. The digits of each product are written one to each side of the diagonal and in those cases in which they are less than 10, they are written in the lower square, writing a zero in the top square. A set consists of 10 rods corresponding to digits 1 to 9. In the figure the rod index is not necessary for actual calculations, but is used as an index for quick reference.

How do Napiers Bones work?
The 'bones' consist of a set of rectangular rods, each marked with a counting number at the top, and the multiples of that number down their lengths. When aligned against the row of multiples, any multiple of the top number can be read off from right to left by adding the digits in each parallelogram in the appropriate row. Using the multiplication tables embedded in the rods, multiplication can be reduced to addition operations and division to subtractions.