Wall in Melon Ground, Lacock Abbey by William Henry Fox Talbot https://www.rawpixel.com/image/14277384/wall-melon-ground-lacock-abbey-william-henry-fox-talbotFree Image from public domain licenseManpower. Boatyard workers. Installing one of the twin diesel engines which will power a fifty-foot steel ramp boat to be… https://www.rawpixel.com/image/12307234/image-face-hand-personFree Image from public domain licenseProduction. Zinc. A stream of molten zinc flows from a furnace at a large smelting operation. From the Eagle-Picher plant… https://www.rawpixel.com/image/12308335/image-plant-person-artFree Image from public domain licenseConversion merry-go-round plant. These hands used to turn out merry-go-rounds to gladden the hearts of the nation's… https://www.rawpixel.com/image/12301374/image-hearts-plant-handFree Image from public domain licenseSubstitute materials. Timber connectors. Timber in process of preparation for timber connectors. The rings provide a larger… https://www.rawpixel.com/image/12303594/image-hand-person-artFree Image from public domain licenseProduction. Subchasers. This adzeman, adept at an ancient trade, hones a razor-edge on a tool that is indispensable in… https://www.rawpixel.com/image/12302241/image-person-man-fashionFree Image from public domain license