...By some optical illusion, it seemed to fall away oneither hand to the depth of three or four feet... 
Richard Harding Davis 「The Congo and Coasts of Africa」
...It is assumed that the photographer knows exactly what the focus of his lens is, and that he is able to measure accurately from its optical center...
John A. Tennant 「Bromide Printing and Enlarging」
...To the angry man,staring back and upward, there came apeculiar optical illusion...
Various 「Astounding Stories of Super-Science, December 1930」
...Some pairsare apparently so close that the best optical means which we possess areincapable of dividing them, whilst others revolve in wide and spaciousorbits...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...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」
...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 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」
...But his health was broken by early trials, and hedied at the age of thirty-nine, while planning new and still moreimportant optical achievements...
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」
...Many of these groups are of the greatestbeauty, with only a moderate optical power...
Simon Newcomb 「Side-lights on Astronomy and Kindred Fields of Popular Science」
...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」
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