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Mechanical digger
Three cog wheels
Set of interlocking Gears
Red alarm clock with green and blue bells on top
Gear
Burning charcoal pile in the final stage, Walpersdorf, Siegen-Wittgenstein district, North Rhine-Westphalia, Germany, Europe
Historic amperemeter, ammeter, Switzerland, Europe
The Corliss EngineAn image of the Corliss Engine, invented by American engineer George Henry Corliss, at the Philadelphia Centennial, Pennsylvania, 1876
Fairmont Water WorksA view of the Fairmont Water Works on the banks of the Schuylkill River, Phildelphia, Pennsylvania, 1970s. (Photo by Hulton Archive/Getty Images)