This film clip shows the manufacture of glass for optical instruments and eyewear used in industry and war. The glass is melted in special pots and furnaces, stirred after founding, and allowed to cool in situ. When cold it is broken up and examined. Defective glass is rejected, and the good glass is molded into slabs, prisms or lenses, and finally annealed. Optical glass has to conform to a rigorous specification. It must have certain specified optical constants, must be free from striae, bubble, strain, and color, and must be durable. Lenses and prisms, used in microscopes, telescopes and other optical instruments, are only as good as their glass. Optical-quality glass must be flawless. Even tiny flecks, streaks, or bubbles can cause distortion. During World War II, optical glass was in great demand, and making it was a slow, crude process. The ingredients were put in ceramic pots, melted, stirred, then cooled. Only about 10 percent of the glass was usable. This is clipped from the 1944 film - To Greater Vision - made by the Bausch and Lomb Optical Company. The entire film shows the manufacture of glass for optical instruments and eyewear used in industry and war and explains how eyes are treated and faulty vision is corrected. The entire film is available at the Internet Archives.
- Күн бұрын
Manufacturing Optical Glass 1944 Bausch and Lomb Optical Company
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