Abacus (regnemaskine)

Abacus betyder (på græsk-latin): Regnebræt, kugleramme eller regnetavle, brugt i regneundervisning og i Orienten som hjælpemiddel ved regning. Tidligere brugtes et bord med tællesten, senere en ramme med kugler, der kan forskydes på vandrette stænger.

I Danmark blev den anvendt indtil ca. 1970.

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Eksterne henvisninger

Abacus applet (Kræver Java)
Nepohualtzintzin The Pre Hispanic Computer Citat: "...The Nepohualtzintzin is an instrument, similar to the abacus or soroban, that serves to make arithmetical and mathematical calculations..."
Maya site: Nepohualtzintzin
Webarchive backup: Mesoamerican abacus (Vær tålmodig - det tager til tid for databasen at hente billedet) Citat: "...And lastly, the evident similarities in the design of the Chinese Solid & Broken Bar and Mesoamerican Bar & Dot number symbols is suggestive of some sort of relationship between the two systems. What that relationship may be is not clear, but it is hoped that further research will reveal its nature..."
- A Comparison of the Organization and Use of Chinese and Mesoamerican Abaci Citat: "...The remains of a 3/4 vigesimal (base twenty number system) abacus were purportedly found in Mexico. Whether or not this is true, the fact remains that the Mesoamerican bar-and-dot number signs appear to fit very systematically into such an arrangement, as demonstrated below..."
- Mayan Abacus Display (og Aztekisk)

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Eksterne henvisninger