'Numeric Demonstrator', c 1900.

'Numeric Demonstrator', c 1900.
Numeric Demonstrator', an elementary teaching aid patented by Ethel Linay in about 1900.. This elementary arithmetical teaching apparatus consists of ten wooden rods with squared paper pasted on them in order to show multiplication visually.
 
Currently on display in:
Mathematics
Year made :
c.1900
Inventory number :
1989-557