Video encyclopedia

Mechanical computer


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Mechanical calculator in action


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Single Board Relay Computer


(1/4) Intro/History: Introducing a 100-year-old mechanical computer

A mechanical computer is built from mechanical components such as levers and gears, rather than electronic components. The most common examples are adding machines and mechanical counters, which use the turning of gears to increment output displays. More complex examples could carry out multiplication and division—Friden used a moving head which paused at each column—and even differential analysis. One model sold in the 1960s calculated square roots.
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    • Electro-mechanical computers