Trachomedusae–Kolbenquallen from Kunstformen der Natur (1904) by Ernst Haeckel. Original from Library of Congress.… https://www.rawpixel.com/image/2272230/free-illustration-image-jellyfish-haeckel-seaFree Image from public domain licenseEngineering: driving wheels of a railway locomotive, and section of piston. Coloured lithograph, 1905, by Stanislas petit. https://www.rawpixel.com/image/13967737/image-technology-public-domain-architectureFree Image from public domain licenseHorsehead pump png, industry line art illustration, transparent background https://www.rawpixel.com/image/11220212/png-illustration-technologyView licenseHorsehead pump png, industry line art illustration, transparent background https://www.rawpixel.com/image/11220226/png-illustration-technologyView licenseHorsehead pump png, industry line art illustration, transparent background https://www.rawpixel.com/image/11220207/png-illustration-technologyView licenseDe Land pool. Aircraft construction class. These carefree high school students are learning the serious business of war… https://www.rawpixel.com/image/12239446/photo-image-hand-people-airplaneFree Image from public domain licenseHalftrac scout cars. Putting precision-made pistons assemblies into precision-made cylinders is a job that fits this former… https://www.rawpixel.com/image/12240178/photo-image-plant-person-technologyFree Image from public domain licenseHorsehead pump, industry line art illustration vector https://www.rawpixel.com/image/11220231/vector-illustration-technology-blackView licenseHorsehead pump, industry line art illustration vector https://www.rawpixel.com/image/11220233/vector-illustration-technology-blackView licenseHorsehead pump, industry line art illustration vector https://www.rawpixel.com/image/11220232/vector-illustration-technology-blackView licenseAluminum casting. This special gauge checks diameter of the piston skirt. Made of aluminum, this piston will be used in army… https://www.rawpixel.com/image/12239742/photo-image-person-animal-womanFree Image from public domain licenseInventions: various types of pistons and plasters. Engraving by T. Jeffrys. https://www.rawpixel.com/image/13960799/inventions-various-types-pistons-and-plasters-engraving-jeffrysFree Image from public domain licenseProduction. Pratt and Whitney airplane engines. Finished master piston rods of the one-piece type, awaiting assembly in… https://www.rawpixel.com/image/12302139/image-airplane-factory-architectureFree Image from public domain licenseAluminum casting. Finished pistons are wrapped and packed for shipment to ordnance depots: they're scheduled for use in army… https://www.rawpixel.com/image/12302023/image-person-shirt-factoryFree Image from public domain licenseHorsehead pump, industry line art illustration https://www.rawpixel.com/image/11503420/horsehead-pump-industry-line-art-illustrationView licenseHorsehead pump, industry line art illustration https://www.rawpixel.com/image/11503394/horsehead-pump-industry-line-art-illustrationView licenseProduction. Pratt and Whitney airplane engines. Pistons, complete with rings, are lined up for assembly in Pratt and Whitney… https://www.rawpixel.com/image/12302165/image-plant-planes-factoryFree Image from public domain licenseProduction. Pratt and Whitney airplane engines. Installing rings on pistons for Pratt and Whitney airplane engines in a… https://www.rawpixel.com/image/12301943/image-plant-person-airplaneFree Image from public domain licenseHorsehead pump, industry line art illustration https://www.rawpixel.com/image/11503368/horsehead-pump-industry-line-art-illustrationView license[Untitled photo, possibly related to: Topeka, Kansas. In the smith shop of the Atchison, Topeka, and Santa Fe Railroad. In… https://www.rawpixel.com/image/12337373/image-person-fire-public-domainFree Image from public domain licenseAluminum casting. The reaming of pin holes in pistons. These bright cylinders are destined for use in the army's jeeps.… https://www.rawpixel.com/image/12307054/image-person-art-factoryFree Image from public domain licenseAluminum casting. The heads of these heat-treated pistons must be spotted prior to Brinnell hardness testing. Young women… https://www.rawpixel.com/image/12307070/image-person-art-tapeFree Image from public domain licenseProduction. Pratt and Whitney airplane engines. They'll soon be adding to the power of our mighty American air forces. Rough… https://www.rawpixel.com/image/12308155/image-background-pattern-airplaneFree Image from public domain licenseAluminum casting. Womens' place in this large Midwest aluminum factory is on the inspection line. She's giving a final… https://www.rawpixel.com/image/12306815/image-person-airplane-womensFree Image from public domain licenseProduction. Pratt and Whitney airplane engines. Pistons, complete with rings, are lined up for assembly in Pratt and Whitney… https://www.rawpixel.com/image/12307134/image-plant-planes-factoryFree Image from public domain licenseTopeka, Kansas. In the smith shop of the Atchison, Topeka, and Santa Fe Railroad. In addition to the making of the railroad… https://www.rawpixel.com/image/12337075/image-people-public-domain-womanFree Image from public domain licenseProduction. Pratt and Whitney airplane engines. Single-row piston rods for Pratt and Whitney airplane engines are cleaned… https://www.rawpixel.com/image/12307009/image-face-plant-personFree Image from public domain licenseProduction. Pratt and Whitney airplane engines. Master piston-rod forgings for Pratt and Whitney airplane engines are… https://www.rawpixel.com/image/12307294/image-plant-person-skiesFree Image from public domain licenseProduction. Aircraft engines. A veteran of the assembly bench, twenty-two-year-old Anne Weinmen, employee of a large Midwest… https://www.rawpixel.com/image/12307027/image-face-plant-handFree Image from public domain licenseProduction. Pratt and Whitney airplane engines. Careful inspections between honings assure compliance with rigid standards… https://www.rawpixel.com/image/12306997/image-hand-person-artFree Image from public domain licenseProduction. Aircraft engines. A veteran of the assembly bench, twenty-two-year-old Anne Weinmen, employee of a large Midwest… https://www.rawpixel.com/image/12306797/image-face-plant-handFree Image from public domain licenseMessrs. Maudslay, Son, and Field's Works, Lambeth: Copenhagen Dock Engines by P Barry https://www.rawpixel.com/image/14320440/image-background-person-public-domainFree Image from public domain license