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Napiers Bones

(Code: 428)
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Napiers BonesJohn Napier (1550 - 1617) was a Scottish mathematician, who made many contributions to arithmetic, including the invention of logarithms. When Kepler found out about Napier's logarithms he applied them to Tycho Brahe's stellar and planetary observations, and established his famous three laws of planetary motion.John Napier is also remembered for 'Napier's Bones', a calculating device that allowed the user to carry out multiplication and division. When Napier was alive, most people could add and subtract small numbers, but very few people could multiply, and long division was considered a university subject!Using the 'bones' you can carry out multiplication and division. For example if you want to multiply 12345 x 6, you arrange the bones in the correct order, and simply read off the answer. However should you wish to multiply a number that contains a digit that occurs more than once, e.g. 266255, then you will need some extra bones. You can either buy a second set, or you can photocopy the existing set of bones.We include a specially written booklet, that explains how to get the best from your 'bones'. 

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Customer reviews
The Napiers bones are superb, my students like them very much.
Piotr Z.
The Napier's Bones is excellent and educational. I was amazed and so were my Grandchildren and their teacher when I took them to school to show them.
Kevin Marriott Review collected by Feefo
Very well made and Grand Illusions seems to be the only place selling them. They came with excellent notes explaining how to use the bones.
Andrew Williams Review collected by Feefo
There is only one set of bones, 0 to 9 but I knew this in advance, your supplier could perhaps improve the product a little by engraving the reverse of each bone as well. For demonstration purposes it works fine. If possible convince your supplier to make versions if Genaille-Lucas rods as well, if they do I will be buying.
Martine Cordon Review collected by Feefo
Jack Pace Review collected by Feefo
Jack Pace Review collected by Feefo
Very pleased with this purchase.
Ann Bataillard Review collected by Feefo
David Parris Review collected by Feefo
This item is FANTASTIC as well as beautifully made.
Barbara Dawson Review collected by Feefo
Small than I thought they'd be. But seem to be right.
Irena Henderson Review collected by Feefo