The 'Tachylemme' ready reckoner, c 1876.
Image number: 10327827
Invented by C L Chambon, the 'Tachylemme' was used to calculate the daily interest on sums of money at various rates.
- Image number:
- 10327827
- Credit:
- Science Museum/Science & Society Picture Library
- Date taken:
- 20 October 2003 18:54
- Image rights:
- Science Museum
