Ophthalmic lenses, dioptric formulae for combined cylindrical lenses : the prism-dioptry, and other optical papers (1907)
Prentice, Charles F. (Charles Frederick), b. 1854 · Philadelphia : Keystone · leaf 142
prismometric scale to practically supplant the prismo-meter as an instrument for verifying measurements. THE PERFECTED PRISMOMETER. i;u The divisions of the graduated bar, numbered 2, o, 4, up to 10, are placed^^ h h i) P to tV of ^^^6 meter* length, counted from tlie knife-edge,which represents… … Fig. 3. edge, marked 1 and 2, which, being equal to correlative centimeter defec-tions at the meter-plane, correspond to their equivalents in prism-dioptries.To facilitate subdivision of these graduations the index-plate is providedwith a transverse slide bearing its allotted part of the…
Lenses · Prisms (Ophthalmology)
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