Boston and Maine railroad shops at Billerica, Massachusetts. Open air furnaces melting the lead from the huge locomotive… https://www.rawpixel.com/image/12339840/image-person-sky-smokeFree Image from public domain licenseDoren Bishop, Robin Mines Superintendent for the Alma Coal Corporation, Looks at the Opening of a New Mine near Clothier and… https://www.rawpixel.com/image/8770380/photo-image-plant-tree-personFree Image from public domain licenseButte, Montana. Anaconda Copper Mining Company. First step in making bits for a pneumatic drilling machine is to heat a rod… https://www.rawpixel.com/image/12151915/image-plant-person-artFree Image from public domain license[Untitled photo, possibly related to: Forge shop. Gas heated furnace. Keystone Drilling Company, Beaver Falls… https://www.rawpixel.com/image/12335681/image-person-public-domain-womanFree Image from public domain licenseTopeka, Kansas. Workmen manipulating a hot forging which is being hammered under a steam hammer in the smith shop of the… https://www.rawpixel.com/image/12337381/image-steam-person-public-domainFree Image from public domain licenseAcetylene welding, a necessary part of oil field activities, Seminole, Oklahoma by Russell Lee https://www.rawpixel.com/image/12170233/image-person-art-vintageFree Image from public domain license[Untitled photo, possibly related to: Blacksmith heating plow point, Southeast Missouri Farms]. Sourced from the Library of… https://www.rawpixel.com/image/12313491/image-person-public-domain-factoryFree Image from public domain licenseA labelled plan and a cross-section of an iron forge. Engraving by W. Lowry after J. Farey. https://www.rawpixel.com/image/13976679/image-paper-cartoon-crossFree Image from public domain licenseProduction. 105 millimeter shells. This red-hot billet is undergoing processing in a hydraulic press, where it will be… https://www.rawpixel.com/image/12306427/image-person-factory-manFree Image from public domain licenseProduction. Copper. Tapping copper matte from a blast furnace at the Garfield, Utah smelter of the American Smelting and… https://www.rawpixel.com/image/12309154/image-plant-person-factoryFree Image from public domain licenseGarfield, Utah. Making molds of blister copper at the Garfield smelter of the American Smelting and Refining Ccompany.… https://www.rawpixel.com/image/12297486/photo-image-technology-public-domain-factoryFree Image from public domain license[Untitled photo, possibly related to: Columbia Steel Company at Ironton, Utah. Pouring a heat of iron]. Sourced from the… https://www.rawpixel.com/image/12297361/photo-image-person-public-domain-factoryFree Image from public domain license[Untitled photo, possibly related to: Topeka, Kansas. A general view of the smith shop of the Atchison, Topeka, and Santa Fe… https://www.rawpixel.com/image/12291175/photo-image-person-fire-public-domainFree Image from public domain licenseForge shop. Gas heated furnace. Keystone Drilling Company, Beaver Falls, Pennsylvania. Sourced from the Library of Congress. https://www.rawpixel.com/image/12283832/photo-image-person-public-domain-factoryFree Image from public domain licenseThe electric furnace at the Farrell-Birmingham Corporation. Ansonia, Connecticut. Sourced from the Library of Congress. https://www.rawpixel.com/image/12277707/photo-image-person-fire-smokeFree Image from public domain license