... and Diagrams of Optical, Mechanical,and other principles as required by the subject matter of the papers publishedin the work... 
Henry J. Slack 「Marvels of Pond-life」
...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」
...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」
...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」
...This eye is the lens ofthe optical instruments...
Camille Flammarion Frances A. Welby 「Astronomy for Amateurs」
...Amongst others, Horrebow,Professor of Astronomy, saw the satellite on March 10 and 11, aftertaking several precautions to prevent optical illusion...
Richard A. Proctor 「Myths and Marvels 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 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」
...He lays great stress upon this, which he considerspoints strongly against the duplication being an optical phenomenon...
Cecil G. Dolmage 「Astronomy of To-day」
...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」
...It is the most striking example of how fully realized that theeye of the observer is a material part of the optical apparatus ofastronomy...
Edward Singleton Holden 「Sir William Herschel: His Life and Works」
...It has been supposed (perhaps on insufficient evidence) that this staris merely an optical double...
Richard A. Proctor 「Half-hours with the Telescope」
...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」
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