them. Large mainsprings in clocks are immobilized by "mainspring clamps" before removal.

History

Mainsprings appeared in the first spring-powered clocks, in 15th-century Europe. They replaced the weight hanging from a cord wrapped around a pulley, which was the power source used in all previous mechanical clocks. Around the year 1400, coiled springs began to be used in locks, and many early clockmakers were also locksmiths. Springs were applied to clocks to make them smaller and more portable than previous weight-driven clocks,

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