Calculating Machines --- Abacus --- Napier's bones --- Slide Rule --- Logarithms --- Calculator

When small children do simple sums, they like to count on their fingers. It's always easier to deal with numbers if you have something to help you. Here are some of the machines that have helped with calculations. The oldest is the abacus, which has been used since before 1000 BC.
## DescriptionsAbacusNapier's bones Slide Rule Logarithms Electronic calculator |
## Stand alone pagesSimple abacusEastern abacus Napier's bones Slide rule Simple calculator Arithmetic calculator |

© Jo Edkins 2007 - Return to Numbers index