'Numeric Demonstrator', c 1900.

Richardson, Claire

'Numeric Demonstrator', c 1900.
3 4 c m
40cm
actual image size: 32cm x 26cm

Description

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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