...The curve which represents with perfect fidelity the movements of aplanet in its revolution around the sun belongs to that well-known groupof curves which mathematicians describe as the conic sections... 
Robert Stawell Ball 「The Story of the Heavens」
... The circle and straight line are considered to be special cases ofthese curves, which, taken collectively, are called the conic sections...
George C. Comstock 「A Text-Book of Astronomy」
..., that an inverse square law will move the body in an ellipseor other conic section with the sun in one focus, and that if a body somoves it must be acted on by an inverse square law...
Oliver Lodge 「Pioneers of Science」
...To prove the connection between the inverse-square law of distance, andthe travelling in a conic section with the centre of force in one focus(the other focus being empty), is not so simple...
Oliver Lodge 「Pioneers of Science」
...If it were a material substance, to which the law ofgravitation applied, it must be moving in a conic section with the sunin one focus, and its radius vector must sweep out equal areas in equaltimes...
Oliver Lodge 「Pioneers of Science」
...Theparticular form of conic section which denotes the orbit of a planet isknown by the name of the ellipse: it is spoken of somewhat lessaccurately as an oval...
Robert Stawell Ball 「The Story of the Heavens」
...Hence three points plus the focus act as five points, anddetermine a conic or curve of the second degree...
Oliver Lodge 「Pioneers of Science」
...Icalled it Seymour's Range, and a conic hill at its western end MountOrmerod...
Ernest Giles 「Australia Twice Traversed, The Romance of Exploration」
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