Optics: lens grinders at work (top) and stages in grinding a lens with the tools used (below). Engraving by Benard after Lucotte. | Wellcome Collection
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Lenses - Engineering and Technology History Wiki
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Lenses - Engineering and Technology History Wiki
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File:Lens grinding machine.jpg - Wikimedia Commons
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Grinding lenses and punties with plated and sintered wheels on a Spatzier lathe - YouTube
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