Ryan, James J. Department of Mechanical Engineering, University of Minnesota, Minneapolis, Minnesota.
- Additional Readings
Elementary mechanical parts used as building blocks for the construction of most devices, apparatus, and machinery. The gradual development of these building blocks, following the invention of the roller or wheel and the arm or lever in ancient times, brought about the Industrial Revolution, starting with the assembly of James Watt's engine for harnessing the force of steam and proceeding into the advanced mechanization of present automatic control.
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