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Engineering: large cogs meshing together, and diagrams of epicycloid curves. Colour lithograph by Stanislas Petit, ca. 1905.
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Engineering: large cogs meshing together, and diagrams of epicycloid curves. Colour lithograph by Stanislas Petit, ca. 1905.

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Engineering: large cogs meshing together, and diagrams of epicycloid curves. Colour lithograph by Stanislas Petit, ca. 1905.

Original public domain image from Wellcome Collection

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