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 171
o great a decentration, must be at least 64 millimeters in di-ameter, and should be ground to a knife-edge to insure maximum thinness.As this example came to the authors notice, the instructions given to the • See page 117. 160 CEMENTED BI-FOCAL LENSES SOLVED BY THB PRISM-DIOPTRY. mechanic, who… … Fi-. 5. Fig. 6. ing its optical center, lay off four points, p. p. p. p., 25 millimeters fromthe center, as shown in diagram Fig. 5 : Replace the lens on the co7ivex grinding tool, and cut the lens throughthe indicated dotted right-angled diameters into four equal parts. Thiswill secure four…
Lenses · Prisms (Ophthalmology)
Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.
