"Numeric Demonstrator", elementary arithmetical teaching apparatus patented by Ethel L. Linay, 10 wooden rods with printed wooden grids, in box
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.
- Object Number:
Lid open: 60 mm x 580 mm x 260 mm, 3.02 kg
Front open: 70 mm x 580 mm x 180 mm, 3.02 kg
- educational aid
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