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Napier's calculating machines, 17th century (after 1617). In a case with doors and thirty drawers are kept the counters of two abacuses, designed by the Scottish mathematician John Napier (1550-1617). The first abacus consists of sixty numbered rods, called "Napier's bones". It was widely spread in Europe, being used as a portable abacus until the 18th century. The second one, called promptuary, is composed of about three hundred numbered and perforated strips for fast multiplications. Verawood with ivory inlay. National Archaeological Museum. Madrid. Spain.

Napier's calculating machines, 17th century (after 1617). In a case with doors and thirty drawers are kept the counters of two abacuses, designed by the Scottish mathematician John Napier (1550-1617). The first abacus consists of sixty numbered rods, called "Napier's bones". It was widely spread in Europe, being used as a portable abacus until the 18th century. The second one, called promptuary, is composed of about three hundred numbered and perforated strips for fast multiplications. Verawood with ivory inlay. National Archaeological Museum. Madrid. Spain.
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Untertitel: Siehe automatische Übersetzung
Napier's calculating machines, 17th century (after 1617). In a case with doors and thirty drawers are kept the counters of two abacuses, designed by the Scottish mathematician John Napier (1550-1617). The first abacus consists of sixty numbered rods, called "Napier's bones". It was widely spread in Europe, being used as a portable abacus until the 18th century. The second one, called promptuary, is composed of about three hundred numbered and perforated strips for fast multiplications. Verawood with ivory inlay. National Archaeological Museum. Madrid. Spain.
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National Archaeological Museum. Madrid. Spain.
Bildnachweis:
Album / Prisma
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Bildgröße:
4016 x 3101 px | 35.6 MB
Druckgröße:
34.0 x 26.3 cm | 13.4 x 10.3 in (300 dpi)
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