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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The engineer's sketch-book of mechanical movements, devices, appliances, contrivances and details employed in the design and construction of machinery for every purposeChapter CXVI: Section 34: Elliptical Motion
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