...The deadly boom of arms was causing the air to vibrate without leaving any optical trace... 
Vicente Blasco Ibanez Charlotte Brewster Jordan 「The Four Horsemen of the Apocalypse」
...To the angry man,staring back and upward, there came apeculiar optical illusion...
Various 「Astounding Stories of Super-Science, December 1930」
...It is not to be supposed that thisincrease is a mere optical consequence of the diminution of distance...
Robert Stawell Ball 「The Story of the Heavens」
...The only other optical treatise written by Kepler, was his Dioptrics,with an appendix on the use of optics in philosophy...
David Brewster 「The Martyrs of Science, or, The lives of Galileo, Tycho Brahe, and Kepler」
...The phenomenon of the black drop, or ligament, is entirely an illusion,and, broadly speaking, of an optical origin...
Cecil G. Dolmage 「Astronomy of To-day」
..." An examination of her surface with very moderate optical aid is,however, quite a revelation, and the view we then get is not easilycomparable to what we see with the unaided eye...
Cecil G. Dolmage 「Astronomy of To-day」
...The Improvement of Telescopes and Optical Apparatus...
Edward Singleton Holden 「Sir William Herschel: His Life and Works」
...It is the most striking example of how fully realized that theeye of the observer is a material part of the optical apparatus ofastronomy...
Edward Singleton Holden 「Sir William Herschel: His Life and Works」
...The developments of optical science have justified in hisobjections, but we cannot accord to him must any considerable part inmaking clear the true nature of the phenomenon...
Edward Singleton Holden 「Sir William Herschel: His Life and Works」
...The subject is not without interestand difficulty as an optical one...
Richard A. Proctor 「Half-hours with the Telescope」
...It has been supposed (perhaps on insufficient evidence) that this staris merely an optical double...
Richard A. Proctor 「Half-hours with the Telescope」
...The maps show all of thestars visible to the naked eye in the regions of sky represented,and, in addition, some stars that can only be seenwith optical aid...
Garrett Serviss 「Pleasures of the telescope」
...Themirage, for example, is an optical illusion which has a starting pointin an external stimulus...
Dr. D.M. Brooks 「The Necessity of Atheism」
...This eye is the lens ofthe optical instruments...
Camille Flammarion Frances A. Welby 「Astronomy for Amateurs」
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