We live in a world of machines. And the technical foundation for these machines lies in the steam engine developed during the 1780s by James Watt. The concept of deriving useful mechanical work from raw fuel such as wood, coal, oil, and now uranium was revolutionary. Watt also developed the slider-crank mechanism to convert reciprocating motion to rotary motion.
To improve on this first, basic engine, the people who followed Watt created the science of thermodynamics and perfected power transmission through gears, cams, shafts, bearings, and mechanical seals. A new vocabulary involving heat, energy, power, and torque was born with the steam engine.
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