1975-08-20
1976-12-07
Apley, Richard J.
35 73, G09B 2304
Patent
active
039953807
ABSTRACT:
There are disclosed several embodiments of a visual aid for use in teaching calculus, each having in common a support means defining X and Y axes, and means mounted on the support means to describe a geometrical shape which is generated by the revolution of an area bounded by a curve about one of the axes.
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Apley Richard J.
Eickenroht Marvin B.
Hyer W. F.
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