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Arithmetical Jewel, 1619.

Arithmetical Jewel, 1619.
2 9 c m
actual image size: 32cm x 21cm


This instrument combines features of the abacus with those of pen reckoning. Numbers are put in by moving the flags to reveal dots. Sums are then worked out as with a pen and paper.

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© Science Museum / Science & Society Picture Library

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