...Its pointed fore part, which we hesitate to call a head, bears absolutely no trace of any optical apparatus; and the same with every other part of the body... 
J. Henri Fabre Alexander Teixeira de Mattos 「The Life of the Fly」
...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」
...To the angry man,staring back and upward, there came apeculiar optical illusion...
Various 「Astounding Stories of Super-Science, December 1930」
...” The optical doublestars are cases where the two components are far distant from each other,and hence can be distinguished in our telescopes as separate points oflight...
E. Walter Maunder 「Are the Planets Inhabited?」
...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 still remains as a remarkable feat of engineering and an example ofgreat optical and mechanical skill...
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」
...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」
...These have been overcome, one after another, untilit is now felt that the best modern telescope, with an object lensof twenty-six inches, has fully reached the limit of optical power...
Henry Warren 「Recreations in Astronomy」
...The optical parts which we furnish are of the highest degree ofexcellence and are made for us by several of the most reliable firmsin this line...
Wm. Gaertner & Co. 「Astronomical Instruments and Accessories」
...A 60degree heavy flint glass prism of best optical quality is included...
Wm. Gaertner & Co. 「Astronomical Instruments and Accessories」
...Themirage, for example, is an optical illusion which has a starting pointin an external stimulus...
Dr. D.M. Brooks 「The Necessity of Atheism」
...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」
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