Anatomy and physiology of the eye, with hints for the preservation of the eyesight (1901)
Herbert, John Frederick, 1860- · Philadelphia, Pa., The author · leaf 62
re is apointed steel bar which projects downward. This is in-tended to fit into the depression in the iron block, and TOOLS FOR C.RIXDI.VG SPHERICAL LENSES. I^ ^^ Figure 35. A. Convex mold or ball for grinding concave spherical surfaces.P.. Concave mold or cup for grinding convex spherical… … Figure 36. A. Convex tool or mold for grinding concave cylindrical surfaces. B. Concave tool or niold for grinding convex cylindrical surfaces. necessary. The glass passes through the following pro-cedure : A piece of optical glass is selected of the requiredthickness—about one and one half to two…
Eye · Lenses
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