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Lens Polishing Device is used for the final process of lens production and is accomplished on a pitch-covered iron tool coated with jeweler's rouge and water. After polishing, the lens is edged by grinding the edge until the physical center and the optical center of the lens coincide. In this process, the lens is mounted in the headstock of a lathe, so that its optical center is on the axis of revolution, and the edges are trued with a strip of brass charged with abrasive.
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