Ophthalmic lenses : dioptric formulae for combined cylindrical lenses, the prism-dioptry and other optical papers / by Charles F. Prentice.

  • Prentice, Charles F. (Charles Frederick), 1854-
Date:
1907
Catalogue details

Licence: In copyright

Credit: Ophthalmic lenses : dioptric formulae for combined cylindrical lenses, the prism-dioptry and other optical papers / by Charles F. Prentice. Source: Wellcome Collection.

Provider: This material has been provided by UCL Library Services. The original may be consulted at UCL (University College London)

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In the appended signs, the upright and horizontal diameters ( | and — ) of the circles denote the axes 90° and 1800, respectively. Practical equivalents can only be produced when the numerals of the formulae coincide with those included in the adopted dioptral series, page 47. For crossed cylinders having the axes of the concave cylinder at 1800 and of the convex cylinder at 90° it is merely necessary to reverse the axes throughout.