...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」
...The light produced was concentratedby a series of parabolic reflectors, directed against a large quartzprism, and thence through a lens which was designed to throw a slightlydivergent beam...
Victor Rousseau 「Astounding Stories of Super-Science January 1930」
...The little cruiser rose slowly under the lift of the fans; then heopened the throttle and swept out in a parabolic curve that ended in avertical line...
Various 「Astounding Stories, May, 1931」
...He made 430 parabolic specula in twenty-oneyears...
George Forbes 「History of Astronomy」
...There is a necessary distinction between parabolic and elliptic motion...
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」
...Inreflectors this is effected by giving a parabolic form tothe concave surface of the mirror...
Garrett Serviss 「Pleasures of the telescope」
...The comets thus follow a very elongated orbit, either elliptic, turninground the Sun, or parabolic, dashing out into space...
Camille Flammarion Frances A. Welby 「Astronomy for Amateurs」
...Had our atmosphere notentangled them, many, circuiting the sun in a parabolic or hyperboliccurve, would have escaped for ever from our system...
E. Walter Maunder 「The Astronomy of the Bible」
...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」
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