...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」
...While the female Glow-worm has her tricks for summoning her swains,the male, on his side, is provided with an optical apparatus suitedto catch from afar the least reflection of the calling-signal...
Jean Henri Fabre Alexander Teixeira de Mattos 「The Glow-Worm and Other Beetles」
...These optical illusions were the cause of much annoyance to the thirsty travellers,—especially to their animals, unable to understand them...
Mayne Reid 「The Giraffe Hunters」
... Thisvery curious optical phenomena has been investigated by Mr...
Henry H. Snelling 「The History and Practice of the Art of Photography」
...This eye is the lens ofthe optical instruments...
Camille Flammarion Frances A. Welby 「Astronomy for Amateurs」
...This is a perennial andvery curious optical illusion...
Camille Flammarion Frances A. Welby 「Astronomy for Amateurs」
...Accounts of wonderful optical experiments by Roger Bacon (who died in 1292),and in the sixteenth century by Digges, Baptista Porta, and Antonio de Dominis(Grant, Hist...
George Forbes 「History of Astronomy」
...By aningenious optical contrivance it is possible to place the spectra fromthe two limbs side by side, which doubles the apparent displacement, andthus makes it much more easy to measure...
Robert Stawell Ball 「The Story of the Heavens」
...The optical contrivances in the eye form an image of the planet on theretina which is necessarily very small...
Robert Stawell Ball 「The Story of the Heavens」
...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」
..." 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」
...So he tells them about his optical researches and his discovery of thenature of white light, writing them a series of papers which were longafterwards incorporated and published as his Optics...
Oliver Lodge 「Pioneers of Science」
...Neither in Paris nor yet at Greenwich was any optical search undertaken;but Professor Airy wrote to ask M...
Oliver Lodge 「Pioneers of Science」
...Indeed, some glasses decidedlyexaggerate the blueness of Vega, but the effect is sobeautiful that one can easily forgive the optical imperfectionwhich produces it...
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」
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