...Camol left the laboratory and returned with a large coil on the topof which was mounted a parabolic reflector... 
Various 「Astounding Stories, August, 1931」
...Anothermode of dark ground illumination is by employing anelegant instrument called a parabolic illuminator, whichneed not be described...
Henry J. Slack 「Marvels of Pond-life」
..."See," directed MacGregor, "itstrikes on this mirror—bright metaland parabolic...
Various 「Astounding Stories of Super-Science February 1930」
... 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」
...'A comet coursing along its parabolic orbit may come full tilt againstour earth...
Richard A. Proctor 「Myths and Marvels of Astronomy」
...A comet of thiskind moves in a parabolic path, sweeps once around the sun, and thenceretreats into the space whence it came...
Robert Stawell Ball 「The Story of the Heavens」
...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」
...He madewith his own hands 430 parabolic mirrors for reflecting telescopes,besides a great number of complete instruments...
Oliver Lodge 「Pioneers of Science」
...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」
...Toovercome the spherical aberration James Gregory, ofAberdeen and Edinburgh, in 1663, in his Optica Promota, proposed areflecting speculum of parabolic form...
George Forbes 「History of Astronomy」
...He made 430 parabolic specula in twenty-oneyears...
George Forbes 「History of Astronomy」
...Their orbits are never like circles; theyare, indeed, more usually parabolic, and thus differ as widely aspossible from the circular path...
Robert Stawell Ball 「The Story of the Heavens」
...If the earth's velocity could beincreased 41 per cent, from 19 up to 27 miles per second, itwould have parabolic velocity, and would quit the sun'scompany...
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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