Tapping a blast furnace, Pittsburgh, Pennsylvania. Sourced from the Library of Congress. https://www.rawpixel.com/image/12301989/image-person-fire-smokeFree Image from public domain licenseWilliam Allen, portrayed as an alchemist with several furnaces, the one which he stokes is labelled "Matter o'money".… https://www.rawpixel.com/image/13951809/image-cartoon-person-bookFree Image from public domain license[Untitled photo, possibly related to: Tapping the slag at a blast furnace, Pittsburgh, Pennsylvania]. Sourced from the… https://www.rawpixel.com/image/12315204/image-person-public-domain-waterFree Image from public domain licensePouring a test mold while blast furnace is being tapped, Pittsburgh, Pennsylvania. Sourced from the Library of Congress. https://www.rawpixel.com/image/12314803/image-person-fire-public-domainFree Image from public domain licenseArbeiders in een metaalbewerkingsbedrijf, waronder drie kinderen (c. 1910) by anonymous https://www.rawpixel.com/image/13757003/photo-image-face-person-airplaneFree Image from public domain licenseTapping the slag at a blast furnace, Pittsburgh, Pennsylvania. Sourced from the Library of Congress. https://www.rawpixel.com/image/12315012/image-steam-public-domain-factoryFree Image from public domain licenseSalvage. Scrap for steel mills. Charging boxes loaded with scrap metal are dumped into electric furnaces where the scrap is… https://www.rawpixel.com/image/12306719/image-eyes-factory-architectureFree Image from public domain license[Untitled photo, possibly related to: Iron furnace in Jackson, Ohio]. Sourced from the Library of Congress. https://www.rawpixel.com/image/12252466/photo-image-sky-smoke-public-domainFree Image from public domain license[Untitled photo, possibly related to: Jefferson furnace-made iron for "Monitor" in Civil War, not far from Jackson, Ohio].… https://www.rawpixel.com/image/12252241/photo-image-plant-tree-public-domainFree Image from public domain license[Untitled photo, possibly related to: Iron furnace in Jackson, Ohio]. Sourced from the Library of Congress. https://www.rawpixel.com/image/12252479/photo-image-person-sky-treeFree Image from public domain licenseJefferson furnace-made iron for "Monitor" in Civil War, not far from Jackson, Ohio. Sourced from the Library of Congress. https://www.rawpixel.com/image/12252471/photo-image-plant-tree-public-domainFree Image from public domain licenseAfter juice is crushed from sugarcane, the pulp is fed to furnace by conveyor, near New Iberia, Louisiana by Russell Lee https://www.rawpixel.com/image/12167787/image-art-vintage-woodFree Image from public domain license