Anatomy and physiology of the eye, with hints for the preservation of the eyesight (1901)
Herbert, John Frederick, 1860- · Philadelphia, Pa., The author · leaf 61
e feet in diameter, of equal thick-ness throughout. The sheet, when fully expanded andcooled, is then tempered. To reduce its brittleness it isthen annealed. It is subsequently polished and cut intoblocks of various sizes. It is then ready for the grinderslathe to be made into lenses. 55 SPECTACLE… … Figure 34. A. Table or stand. B. Trough. C. Lever. D. Steel bar, the point of which holds lens in position on the grinding tool. K. Revolving spindle. F. Tool or mold on which the lens is ground. is mounted on a stand or table. (See figure 34.) A verti-cal .spindle-box passes through the bottom of…
Eye · Lenses
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