Thomas Graham. Lithograph by W. Bosley, 1849, after A. Claudet. https://www.rawpixel.com/image/14018199/thomas-graham-lithograph-bosley-1849-after-claudetFree Image from public domain licenseFamous chemists, gathered around a table. Lithograph by Shapper after J.E. Mayall, 1850. https://www.rawpixel.com/image/14019086/image-face-people-bookFree Image from public domain licenseThomas Graham. Lithograph by W. Bosley, 1849, after A. Claudet. https://www.rawpixel.com/image/14009687/thomas-graham-lithograph-bosley-1849-after-claudetFree Image from public domain licenseJames Johnstone. Steel engraving by G.T. Doo after W.T. Roden, 1868. https://www.rawpixel.com/image/14001870/james-johnstone-steel-engraving-gt-doo-after-wt-roden-1868Free Image from public domain licenseThomas Graham. Stipple engraving by C. Cook after A. Claudet. https://www.rawpixel.com/image/13984223/thomas-graham-stipple-engraving-cook-after-claudetFree Image from public domain licenseJames Johnstone. Steel engraving by G.T. Doo after W.T. Roden, 1868. https://www.rawpixel.com/image/13996809/james-johnstone-steel-engraving-gt-doo-after-wt-roden-1868Free Image from public domain license