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aeolipile American animals atomic fuel automation automobile began Benz boring mill Bronze Age bucket build built called cams centuries chine circuits coal copper cylinder device distance drill effort arm electricity electronic energy England factories farmers farming Fertile Crescent fire fist ax fulcrum furnace gear GRANGER COLLECTION hammered hand harness heat Hero's holes horse important inch inclined plane Industrial Revolution internal-combustion engine invention inventors Iron Age Karl Benz laser lathe learned lever Leyden Jar light machine tools machinery magnet man's manufacturing mechanical metal miles million Miner's Friend motion motor move musket needed neutrons Olduvai Gorge operation patent plow pole produce pull pulley pumping reactors rock scientist screw shape signal simple machines spinning steam engine stick Stone Age subatomic particles tape things tion toolmaking transducers turn United uranium valve water wheel Watt wheel and axle Whitney wire