...Each of them is an opened parabola of such spread that theirbeams will cover an area ten yards in diameter at fifty miles above theearth... 
Various 「Astounding Stories of Super-Science July 1930」
...It will here be only necessary to point to the connectionwhich exists between the parabola and the ellipse...
Robert Stawell Ball 「The Story of the Heavens」
...It had been observed in 1786, 1795, and1805, but on these occasions it had not been noticed that the comet'spath deviated from the parabola...
Robert Stawell Ball 「The Story of the Heavens」
...This comet followed a path whichcould not be certainly distinguished from a parabola, though there is nodoubt that it might have been a very elongated ellipse...
Robert Stawell Ball 「The Story of the Heavens」
...Theexcentricity of its orbit is enormous—in other words, it is either avery elongated ellipse or a parabola...
Oliver Lodge 「Pioneers of Science」
...It may be a parabola, an ellipsis, spiral, circular, &c...
Paul Henri Thiery (Baron D'Holbach) 「The System of Nature, Volume 1」
...Hevelius made numerous researches on comets, and suggested that theform of their paths might be a parabola...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...Astronomers, therefore, consider meteors as well ascomets to have the parabola and the elongated ellipse astheir characteristic orbits...
George C. Comstock 「A Text-Book of Astronomy」
...As a matter of fact the path of a projectile in vacuo is onlyapproximately a parabola...
Oliver Lodge 「Pioneers of Science」
...The comet of 1680, Newton foundto move in an orbit so nearly a parabola that the time of describing itmust be reckoned in hundreds of years at the least...
Oliver Lodge 「Pioneers of Science」
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