The engineer's sketch-book of mechanical movements, devices, appliances, contrivances and details employed in the design and construction of machinery for every purpose

by Thomas Walter Barber

Section 34.—ELLIPTICAL MOTION.

(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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