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![Characteristics of striæ in optical glass . Fig. II.—Rolled window plate of Fig. 10 viewed flatwise4. STRI^ AND DEFINITION The effect of striae upon definition of an image produced by anoptical system Characteristics of striæ in optical glass . Fig. II.—Rolled window plate of Fig. 10 viewed flatwise4. STRI^ AND DEFINITION The effect of striae upon definition of an image produced by anoptical system](https://c8.alamy.com/comp/2AN26T8/characteristics-of-stri-in-optical-glass-fig-iirolled-window-plate-of-fig-10-viewed-flatwise4-stri-and-definition-the-effect-of-striae-upon-definition-of-an-image-produced-by-anoptical-system-in-which-they-are-present-is-an-important-questionto-which-it-is-difficult-to-give-a-definite-answer-in-general-it-isobvious-that-striae-which-are-sufficiently-heavy-and-dense-will-ism-optical-glass-83-injure-the-definition-and-a-mere-glance-edgewise-through-thewindow-plate-of-fig-10-or-through-the-plate-of-fig-13-at-a-straightedge-makes-it-evident-that-such-irregular-refract-2AN26T8.jpg)