its number were marked on a set of rectangular rods
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its number were marked on a set of rectangular rods. ......
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John Napier, the inventor of logarithms, also invented this aid to calculation known as 'Napier's Bones' in 1617. 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.
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