Mathematicians and astronomers: twenty portraits. Engraving by J.W. Cook, 1825. https://www.rawpixel.com/image/13989355/mathematicians-and-astronomers-twenty-portraits-engraving-jw-cook-1825Free Image from public domain licenseNicolas Copernicus among other astronomers of the world. Process print after a wood engraving by J. Styfi and J. Holewinski… https://www.rawpixel.com/image/13985514/image-cartoon-person-artFree Image from public domain licenseJoannes Hevelius [Hewelke], his funerary monument. Line engraving. https://www.rawpixel.com/image/13992838/joannes-hevelius-hewelke-his-funerary-monument-line-engravingFree Image from public domain licenseJoannes Hevelius [Hewelke]. Line engraving by L. Visscher after A. Stech. https://www.rawpixel.com/image/13995418/joannes-hevelius-hewelke-line-engraving-visscher-after-stechFree Image from public domain licenseJoannes Hevelius [Hewelke]. Line engraving by J. Baker after A. Stech, 1677. https://www.rawpixel.com/image/14018279/joannes-hevelius-hewelke-line-engraving-baker-after-stech-1677Free Image from public domain licenseJoannes Hevelius [Hewelke]. Mezzotint by J. Faber after A. Stech, 1677. https://www.rawpixel.com/image/13991534/joannes-hevelius-hewelke-mezzotint-faber-after-stech-1677Free Image from public domain license