...While the female Glow-worm has her tricks for summoning her swains, themale, on his side, is provided with an optical apparatus suited tocatch from afar the least reflection of the calling signal... 
J. H. Fabre 「The Wonders of Instinct」
...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」
...Short was aware of therisk of optical illusion in such matters, and therefore observed Venuswith a second telescope; he also used four eye-pieces of differentmagnifying power...
Richard A. Proctor 「Myths and Marvels of Astronomy」
...Theywere, however, mere optical illusions, due to the imperfect definingqualities of the telescope with which he observed the planet...
Richard A. Proctor 「Myths and Marvels of Astronomy」
...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 instrument he is to use should be that marvellous pieceof mechanical and optical skill known as the heliometer...
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」
...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」
...As a camera obscura is actually atelescope, magnifying objects in proportion to the focal length of thelens employed, he may be said to have first seen these spots with theaid of an optical instrument...
David Brewster 「The Martyrs of Science, or, The lives of Galileo, Tycho Brahe, and Kepler」
..." 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」
...Place this reflector in the prolongation of the optical axis, set thecandle so that the light from the reflector shall be shown through theglass, and look through the opening...
Simon Newcomb 「Side-lights on Astronomy and Kindred Fields of Popular Science」
...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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