section_path: History/Computers/Weight-driven clocks
section_name: Weight-driven clocks
paragraph_text: Weight-driven clocks
  
  Bolter credits the invention of the weight-driven clock as "the key invention," specifically the verge escapement mechanism that provides the tick and tock of a mechanical clock. "The accurate automatic machine" led immediately to "mechanical automata " beginning in the 13th century and finally to "computational machines"—the difference and analytical engines of Charles Babbage and Ada Lovelace in the mid-19th century. Lovelace is credited with the first creation of an algorithm intended for processing on a computer, Babbage's analytical engine, which is the first device considered a real Turing-complete computer instead of just a calculator. Lovelace is sometimes called "history's first programmer" as a result, though a full implementation of Babbage's second device would not be realized until decades after her lifetime.