...Camol left the laboratory and returned with a large coil on the topof which was mounted a parabolic reflector... 
Various 「Astounding Stories, August, 1931」
...Hecollected all the reliable observations of comets he could find, to the numberof twenty-four, and computed their parabolic orbits by the rules laid down byNewton...
George Forbes 「History of Astronomy」
...Finally, he arrived at the conclusionthat all of these comets were identical, travelling in an ellipse so elongatedthat the part where the comet was seen seemed to be part of a parabolic orbit...
George Forbes 「History of Astronomy」
...'A comet coursing along its parabolic orbit may come full tilt againstour earth...
Richard A. Proctor 「Myths and Marvels of Astronomy」
...There is a necessary distinction between parabolic and elliptic motion...
Robert Stawell Ball 「The Story of the Heavens」
...The slowness with which these bodies move when farfrom the sun is strikingly illustrated by an equation ofcelestial mechanics which for parabolic orbits takes theplace of Kepler's Third Law—viz...
George C. Comstock 「A Text-Book of Astronomy」
...He made 430 parabolic specula in twenty-oneyears...
George Forbes 「History of Astronomy」
... Other comets, including most of the ``great'' ones, appear to travel in parabolic or, in a few cases, hyperbolic orbits, which, not being closed curves, never bring them back again...
Garrett Serviss 「Curiosities of the Sky」
...Because comet orbits arenearly parabolas, it used to be assumed that they wereexactly parabolic, and this carried with it the conclusionthat comets have their origin outside the solar system...
George C. Comstock 「A Text-Book of Astronomy」
...It is possible,from the shape of its orbit, that it has a periodic time of ninethousand years, or that it may have a parabolic orbit, and neverreturn...
Henry Warren 「Recreations in Astronomy」
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