Arithmetical Jewel, 1619.
2 9 c m
40cm
actual image size: 32cm x 21cm

Arithmetical Jewel, 1619.

© Science Museum / Science & Society Picture Library

Description

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.
 

Image Ref.

10302725
 

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