Toy balance concept-developing device

Details Toy balance concept-developing device Toy balance concept-developing device

1989-01-09

1989-10-03

Grieb, William H.

Education and demonstration

Mathematics

Arithmetic

G09B 1902

Patent

active

048713147

ABSTRACT:
A toy balance concept-developing device for helping children to develop a concept of balance, including a housing, a beam, a positioning means, a model and a number of plastic weights. Owing to the weight difference between the weight on two distal end of the beam, the beam is rotatable to activate the pointer to indicate if the beam is in balance.

REFERENCES:
patent: 2402892 (1946-06-01), Hubble
patent: 3486244 (1969-12-01), Horn
patent: 4218835 (1980-08-01), Iseki
patent: 4240213 (1980-12-01), Lutin

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