Education and demonstration – Mathematics – Arithmetic
Patent
1985-02-08
1985-11-19
Skogquist, Harland S.
Education and demonstration
Mathematics
Arithmetic
G09B 2302
Patent
active
045539448
ABSTRACT:
An improved teaching device which aids abstract learning through visual and practical application. The device has three compartments which are enclosed with transparent face and back plates, a base, a top plate and side walls. Two interior plates and the side walls form the three compartments where one of the plates mounted on the base does not reach the top plate so that the two compartments it forms are not sealed off. The third compartment is formed by an interior plate mounted on the base and reaches the top plate, forming a common wall between one of the two previous compartments and the third compartment, and sealing of the third compartment. Enclosed in the third compartment is a number of items, such as marbles, the number of which are the sum of similar items dispersed in the two previous compartments. By turning the device upside down and shaking the items in the first two compartments will disperse into the two compartments in different combinations but the sum of the two compartments always remains the same and similar to the number in the third compartment.
REFERENCES:
patent: 1483916 (1924-02-01), Troidl
patent: 2842870 (1958-07-01), Lilly
patent: 3209470 (1965-10-01), Plumb
patent: 3874096 (1975-04-01), Romstad
Skogquist Harland S.
Steele Alan E.
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