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Chapter CXVI: Section 34: Elliptical Motion

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(_See also p. 82._)

=2139. Crank motion to describe ovals= (egg shaped, not true ellipses).

=2140. Ellipsograph.= The point ~A~ is fixed and the point ~B~ travelled along the line ~A B~.

=2141. String ellipsograph;= ~A~ and ~B~ are fixed in the foci of the ellipse and the string joined so that the pencil ~C~ (with string wheel on it) will reach the end of minor axis ~D~; the pencil will describe a true ellipse.

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