Ophthalmic lenses, dioptric formulae for combined cylindrical lenses : the prism-dioptry, and other optical papers (1900)
Prentice, Charles Frederick, b. 1854 · Philadelphia : Keystone · leaf 35
the bi-cylindrical lens. Fig. 24,represented as consisting of two crossed convex cylinders (<?^ and c-) of un-equal curvature, VFH^ and l-F-l- will be the respective elementary focallines. The distance between them (F^ to F-) has been termed, by Sturm, the focal interval.* 29 30 COMPOUND LENSES.… … Fig. 24.Convex Cylindro-cylindrical Lens (+ ci axis 180° + c- axis 90 § 26. The combined refraction of the cylinders, however, definitelymodifies this specific condition, and in the following manner: The outermost incident rays P, in the central horizontal plane, whichwould have been directed to…
Lenses
Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.
