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A polariscope is an optical device used to examine the stress patterns within transparent materials, such as glass or plastics. By passing polarized light through the material, the polariscope reveals areas of stress and strain, which appear as colorful patterns or fringes. This tool is essential in quality control and research, helping engineers and scientists identify potential weaknesses or defects in materials. Polariscopes are widely used in industries like manufacturing, aerospace, and construction to ensure the integrity and reliability of materials under various stress conditions.

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