'Numeric Demonstrator', c 1900.
3 4 c m
actual image size: 32cm x 26cm

'Numeric Demonstrator', c 1900.

Richardson, Claire

© Science Museum / Science & Society Picture Library


This elementary arithmetical teaching apparatus, patented by Ethel Linay in about 1900, consists of ten wooden rods with squared paper pasted on them in order to show multiplication visually.



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