Machines: a steel processing furnace at Paris. Engraving, c.1861. https://www.rawpixel.com/image/13959944/machines-steel-processing-furnace-paris-engraving-c1861Free Image from public domain licenseA cynical doctor describes the contents of his new cough mixture. Coloured lithograph by C. Jacque, 1844. https://www.rawpixel.com/image/13974793/image-face-person-medicineFree Image from public domain licenseChemistry: multiple vessels for distillation, on a furnace. Woodcut after M. Augusti. https://www.rawpixel.com/image/13980726/image-paper-cartoon-personFree Image from public domain licenseChemistry: a multi-tiered furnace for distillation. Woodcut after M. Augusti. https://www.rawpixel.com/image/14016024/chemistry-multi-tiered-furnace-for-distillation-woodcut-after-augustiFree Image from public domain licenseIron: rolling machine (top), and elevation and cross-section of two blast furnaces (below). Engraving c.1861. https://www.rawpixel.com/image/13971227/image-cartoon-person-crossFree Image from public domain license