'Numeric Demonstrator', c 1900.

Richardson, Claire

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


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.

© Science Museum / Science & Society Picture Library

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