The 'Multiplicateur Enfantin' ready reckoner, c 1880.

The 'Multiplicateur Enfantin' ready reckoner, c 1880.
Automatic calculator: Chambon's "Multiplicateur Enfantin". The device shows multiplication tables up to 50 times 28.
 
Currently on display in:
Mathematics
Year made :
1880-1884
Inventory number :
1884-3