Arithmetical Jewel, 1619.
Image number: 10302725
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 number:
- 10302725
- Credit:
- Science Museum/Science & Society Picture Library
- Date taken:
- 20 October 2003 13:34
- Image rights:
- Science Museum
