Thingiverse
Napier's Bones (Manual Calculator) by Gyrobot
by Thingiverse
Last crawled date: 4 years, 7 months ago
Napier's Bones is a manually-operated calculating device created by John Napier (1550-1617).
Using the multiplication tables embedded in the "bones", multiplication and divisions can be reduced to a series of simple additions and subtractions.
My words cannot do justice to this great little tool so I will let Wikipedia explain it for you, see examples on how to use :http://en.wikipedia.org/wiki/Napier%27s_bones#Example_1
Currently printing, more print photo's to follow.http://www.gyrobot.co.ukhttp://www.facebook.com/gyrobotuk
Using the multiplication tables embedded in the "bones", multiplication and divisions can be reduced to a series of simple additions and subtractions.
My words cannot do justice to this great little tool so I will let Wikipedia explain it for you, see examples on how to use :http://en.wikipedia.org/wiki/Napier%27s_bones#Example_1
Currently printing, more print photo's to follow.http://www.gyrobot.co.ukhttp://www.facebook.com/gyrobotuk