The 'Tachypoly Plasiasme' ready reckoner, 1880-1884.
Image number: 10327829
Invented by C L Chambon in 1880, the 'Tachypoly Plasiasme' ready reckoner showed multiplication tables up to 100 times 100.
- Image number:
- 10327829
- Credit:
- Science Museum/Science & Society Picture Library
- Date taken:
- 30 October 2003 09:16
- Image rights:
- Science Museum
