19th century. A rare set of Napier's bones, consisting of a carved and incised wood box with ten rectangular rods; box measures 2.25 x 3.5 in. Invented by mathematician John Napier (Scottish, 1550-1670), Napier's bones is a calculating device which uses a series of numbered rods to multiply, divide, and extract square roots. The term bones refers to the numbered rods themselves which were originally made of ivory or horn. Provenance: From the Estate of Kenneth Erwin, Portland, Michigan Condition: An age split.
19th century. A rare set of Napier's bones, consisting of a carved and incised wood box with ten rectangular rods; box measures 2.25 x 3.5 in. Invented by mathematician John Napier (Scottish, 1550-1670), Napier's bones is a calculating device which uses a series of numbered rods to multiply, divide, and extract square roots. The term bones refers to the numbered rods themselves which were originally made of ivory or horn. Provenance: From the Estate of Kenneth Erwin, Portland, Michigan Condition: An age split.
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.jpg "Quelle: Christie's")
.jpg "Quelle: Christie's")
