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<p>Book digitized by Google from the library of the New York Public Library and uploaded to the Internet Archive by user tpb.
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<br>Subjects: aberration; lens; pencil; rays; image; axis; plane; incident; refracted; curved; focal length; incident pencil; oblique aberration; secondary foci; second approximation; spherical mirror; conjugate foci; virtual image; small compared; refracted pencil</div>
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Richard Potter</div>
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