Abacus
Overview[Bearbeiten]
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Chinese abacus
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Chinese abacus, big
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Chinese abacus, long
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Chinese abacus
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Danish abacus from an elementary school.
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German abacus
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Japanese soroban
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Polish abacus
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Reconstruction of a Roman abacus
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A Russian abacus
History[Bearbeiten]
Abacus in Ancient pictures[Bearbeiten]
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145 AD
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177 AD
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204 AD
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218 AD
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236 AD
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Roman abacus from 1911 Encyclopædia Britannica
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Reconstruction of Roman Abacus, made by RGZ Museum Mainz in 1977
Abacus in Medieval pictures[Bearbeiten]
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Monastic abacus, 10-12th century
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End of 13th century
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1340
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14th century
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14 - 15th century
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1459
Abacus in 16th century pictures[Bearbeiten]
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1504
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1508
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1514
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1525
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1532
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1543
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1544
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1553
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1573
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1574
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1592
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Ming Dynasty (1368–1644)
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Rechentisch (Holzschnitt vermutlich aus Straßburg)
Abacus in pictures in Modern times[Bearbeiten]
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2nd quarter of 17th century
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2nd quarter of 17th century
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1641
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1685
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1884-85
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1892
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1899
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Early 20th century
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1914
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1930
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1938
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2007
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2011
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Huge Abacus at Guohua Abacus Museum
Specific topics[Bearbeiten]
Abacus in art[Bearbeiten]
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Rotschild canticles Septem artes liberales, 13th century
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1504
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1500-50
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Hokusai, 1760
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early 20th century
Types of abacus[Bearbeiten]
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Abacus anagoria
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Binary abacus
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Long abacus
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Napier's abacus
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Positional decimal system on abacus
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School abacus
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Sharp abacus
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Soroban
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Table football abacus
The Small Abacus of Al-Khwarizmi[Bearbeiten]
Addition examples[Bearbeiten]
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6
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+ 4
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= 10
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40
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+12
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=52