[Potomac Creek Bridge, Haupt truss contruction, Aquila Creek, Fredericksburg Railroad, Va. by A J Russell https://www.rawpixel.com/image/14265244/photo-image-person-wooden-skyFree Image from public domain licenseArchitecture: diagrammatic roof trusses. Engraving [after S. H. Brooks], 1850. https://www.rawpixel.com/image/13989130/architecture-diagrammatic-roof-trusses-engraving-after-brooks-1850Free Image from public domain licenseBridge of Board Trusses Being Tested for Deflections by A J Russell https://www.rawpixel.com/image/14277087/bridge-board-trusses-being-tested-for-deflections-russellFree Image from public domain licenseBuilding Military Railroad Truss Bridge across Bull Run, April, 1863 by A J Russell https://www.rawpixel.com/image/14276300/image-wooden-water-public-domainFree Image from public domain licenseExperimental Suspension Trusses, Alexandria, Va. by A J Russell https://www.rawpixel.com/image/14276257/experimental-suspension-trusses-alexandria-va-russellFree Image from public domain licenseEngineering: a wide-span wooden truss-beam roof. Engraving by J. Davis after R. Tredgold, 1820. https://www.rawpixel.com/image/14017052/image-paper-pattern-skyFree Image from public domain licenseGotthardbahn: Obere Mayenreussbrücke by Adolphe Braun and Cie https://www.rawpixel.com/image/14316175/gotthardbahn-obere-mayenreussbrucke-adolphe-braun-and-cieFree Image from public domain licenseArchitecture: two composite roof trusses. Engraving by E. Turrell, 1847. https://www.rawpixel.com/image/13972517/architecture-two-composite-roof-trusses-engraving-turrell-1847Free Image from public domain licenseBoring holes in a bridge truss for explosives by A J Russell https://www.rawpixel.com/image/14277119/boring-holes-bridge-truss-for-explosives-russellFree Image from public domain licensePart of Construction Corps building new Military Truss Bridge across Bull Run, April 1863 by A J Russell https://www.rawpixel.com/image/14278581/image-person-wooden-waterFree Image from public domain license