Franz Karl Naegele. Lithograph by A. Maurin after C. L'Allemand. https://www.rawpixel.com/image/14008142/franz-karl-naegele-lithograph-maurin-after-lallemandFree Image from public domain licenseJean-Antoine-Claude Chaptal, Comte de Chanteloup. Engraving by C. Cook after J.J.F. Monanteuil. https://www.rawpixel.com/image/13997395/image-face-person-artFree Image from public domain licenseMichel Eugène Chevreul. Engraving by C. Cook after A. Maurin. https://www.rawpixel.com/image/14011077/michel-eugene-chevreul-engraving-cook-after-maurinFree Image from public domain licenseFranz Karl Naegele. Lithograph by A. Maurin after C. L'Allemand. https://www.rawpixel.com/image/13999353/franz-karl-naegele-lithograph-maurin-after-lallemandFree Image from public domain license