Ophthalmic lenses, dioptric formulae for combined cylindrical lenses : the prism-dioptry, and other optical papers (1900)
Prentice, Charles Frederick, b. 1854 · Philadelphia : Keystone · leaf 124
as the unit of measure forthe refraction of simple prisms, having been shown, and whereas prismsare frequently combined with spherical lenses, it is here proposed tofurther consider the relations of the prism-dioptry to such combinations,as well as to the equivalents which are to be obtained by a… … Fig. 5. The ray, ie, which is parallel to the optical axis, and incident at aneccentric point e, of the lens, being refracted to „xie focal point /will sus- * In the original pai)€r, the first, and consequently more or less crude prismometer, was described asbeing capable of measuring prisms up to…
Lenses
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