What specific clock construction dating around 1330 AD provides historical evidence mentioning "metal springs"?
Answer
Glastonberry Clock
Although the widespread use of functional coiled springs in machinery is strongly associated with the 15th century door locks, historical evidence points to an even earlier specific instance involving timekeeping technology. The Glastonberry Clock, documented around the year 1330 AD, is cited as the first known clock construction that explicitly recorded the use of 'metal springs.' This predates the 15th-century widespread application but falls within the period where the evolution toward specialized metal components for precise applications was beginning to accelerate, eventually leading to miniaturization in 16th-century watches.
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