The 'Tachypoly Plasiasme' ready reckoner, 1880-1884.

Image number: 10327829

The 'Tachypoly Plasiasme' ready reckoner, 1880-1884.

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