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Technology: Medieval & Early Modern

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Napier's Bones; example.
17th c French Industrial Arts

c. 1600-1617
17th c
Wood
Construction
Calculator
Lyon. France.
Paris. Musée des Arts et Metiers.
osfr0051
Each bone descends in multiples of the number at the top. The carry digit is placed above the diagonal if the multiple equals 10 or more. By adding the resulting numbers parallel to the diagonal WITHIN THE ROW of the multiplicand at the left; one achieves the answer. Sometimes; further carrying may be necessary. For example 9 x 512994 = 4616946.

Caption: NAPIER John | Napier's Bones; example. | c. 1600-1617 | French |
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