Education and demonstration – Mathematics – Arithmetic
Patent
1994-06-16
1995-11-28
Mancene, Gene
Education and demonstration
Mathematics
Arithmetic
434214, G09B 102
Patent
active
054702348
ABSTRACT:
A design for a circular, piece-matching math educational aid is disclosed. It contains a holding plate and various fraction pieces. The circular holding plate has a clockwise spiral bottom, designed in such a way that a sloped cliff is formed at the joint of the starting and ending point. The edge of the cliff is lined up with a guiding mark "0" on a fraction scale marked on an elevated wall on the outer circumference of the holding plate. The fraction pieces contain numerous pie-shaped segments. Any of the segments can precisely depict a fraction, based on the ratio of its center angle to the circle, 360 degrees. The pieces can be made with any center angles, such as 5, 7.5, 10, 30, 45, 60, 90, 180 degrees, etc.
REFERENCES:
patent: 342651 (1886-05-01), Southworth
patent: 1132272 (1915-03-01), Jacobs
patent: 3866919 (1975-02-01), Powell
patent: 3996675 (1976-12-01), Placek
Mancene Gene
Smith Jeffrey A.
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