Beweging van paard van stap naar draf met afstanden op meetlat (1739 - 1812) by Johannes le Francq van Berkhey https://www.rawpixel.com/image/13762538/image-paper-horse-cartoonFree Image from public domain licenseTropische vis Chromis epse (1739 - 1812) by Johannes le Francq van Berkhey https://www.rawpixel.com/image/13788208/tropische-vis-chromis-epse-1739-1812-johannes-francq-van-berkheyFree Image from public domain licenseGeorg Simon Kluegel. Line engraving by G. A. Liebe, 1790, after J. Rieter. https://www.rawpixel.com/image/14020976/georg-simon-kluegel-line-engraving-liebe-1790-after-rieterFree Image from public domain license