Early Tools and Machines Already in early cultures men aimed at the expansion of their physical power in order to facilitate work processes. In prehistoric times first tools made of stone were developed and some thousand years later followed by the invention of simple mechanical devices and machines such as the wheel, the lever and the pulley. Next came the construction of powered machines. Waterwheels, windmills and simple steam-driven devices did no longer require human strength to be operated. In China for example trip-hammers powered by flowing water and waterwheels were already used some 2,000 years ago. Besides tools and machines, which helped to extend men's physical power also devices to support mental faculties, especially in the field of mathematics, were invented. As soon as 3000 BC the abacus was developed in Babylonia. By using a system of sliding beads arranged on a rack early merchants could make computations, which helped them keep track of their trading transactions. Also, early "industrial-robot devices" were developed as soon as 250 BC. The clepsydra, or water clock, which improved upon the hourglass by employing a siphon principle to automatically recycle itself, was constructed by a Greek inventor and physicist, Ctesibius of Alexandria.

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Henry Ford b. July 30, 1863, Wayne County, Michigan, U.S. d. April 7, 1947, Dearborn, Michigan, U.S. American industrialist who revolutionized factory production with his assembly-line methods. Celebrated as both a technological genius and a folk hero, Ford was the creative force behind an industry of unprecedented size and wealth that in only a few decades permanently changed the economic and social character of the United States. Once Ford realized the tremendous part he and his Model T automobile had played in bringing about this change, he wanted nothing more than to reverse it, or at least to recapture the rural values of his boyhood. Henry Ford, then, is an apt symbol of the transition from an agricultural to an industrial America.

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