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Ophthalmic lenses, dioptric formulae for combined cylindrical lenses : the prism-dioptry, and other optical papers (1900)
Prentice, Charles Frederick, b. 1854 · Philadelphia : Keystone · leaf 47
.-^-. \ Fig. 32.Concavo-convex Sphero-cylindrical Lens (- 5^ O-f ^2 axia 180°). and cylindrical curvatures, according to § 33, the demanded positive andnegative elements of refraction for the principal meridians of the crossedcylindrical lens, Fig. 30, are fulfilled. 42 COMPOUND LENSES. To… … Fig, 30c. Fig. 31c. Fig. 32c. Formula Ic. — 1.5 cyl. axis 90° C + 3.5 cyl. axis 180°. (Fig. 30.) RefractionFig. 30c. Formula lie +3.5 spherical C — 5 cyl. axis 90°. (Fig. 31.) EefraetionFig. 31c. Formula IIIc. — 1.5 spherical C + 5 cyl. axis 180°. (Fig. 33.) Fig. 32c.Eefraetion 1—1.5 horizontal C +…Lenses
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