...To the angry man,staring back and upward, there came apeculiar optical illusion... 
Various 「Astounding Stories of Super-Science, December 1930」
...But itwas an optical effect only...
Various 「Astounding Stories of Super-Science April 1930」
...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 very obviousexplanation that the whole duplication is an optical illusion has beenbrought forward more than once, but never in a conclusive manner...
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 optical andmechanical difficulties which prevented a farther advance required timefor their solution; and, indeed, some of these difficulties are scarcelysolved at this day...
Edward Singleton Holden 「Sir William Herschel: His Life and Works」
...The Improvement of Telescopes and Optical Apparatus...
Edward Singleton Holden 「Sir William Herschel: His Life and Works」
...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 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」
...This is a perennial andvery curious optical illusion...
Camille Flammarion Frances A. Welby 「Astronomy for Amateurs」
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