History
Mainsprings appeared in the first spring powered clocks, in 15th century Europe. Around 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, evolving into the first pocketwatches by 1600. Many sources erroneously credit the invention of the mainspring to the Nürnberg clockmaker Peter Henlein (also spelled Henle, or Hele) around 1511. However, many references in 15th century sources to portable clocks 'without weights', and at least two surviving examples, show that spring driven clocks existed by the early years of that century. The oldest surviving clock powered by a mainspring is the Burgunderuhr (Burgundy Clock), an ornate, gilt chamber clock, currently at the Germanisches Nationalmuseum in Nurnberg, whose iconography suggests that it was made around 1430 for Philippe the Good, Duke of Burgundy.
The first mainsprings were made of steel without tempering or hardening processes. They didn't run very long, and had to be wound twice a day. Henlein was noted for making watches that would run 40 hours between windings.
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