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The Scottish mathematician John Napier (1550-1617) invented this abacus.
In 1617, the year of his death, Napier published in Edinburgh a short work in Latin titled Rabdologiae, in which he dealt with products and quotients of numbers.
In the book, Napier describes a series of rods which he had invented –later known as Napier’s bones– which, placed in different ways, allowed him to solve multiplication problems, long divisions and square and cubic roots. His method reduced these multiplication problems to sums and quotients were reduced to subtractions; with the help of his logarithmic tables, exponentiations were simplified to products and roots simplified to divisions.
This development was of great usefulness for day-to-day calculations and anticipated later calculating machines.
Length: 6.1” / Width: 10.63” / Height: 1.57”