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Main spring
The coiled metal ribbon used to drive a clock's mechanism. Originally clocks were all weight-driven, and it is thought that a spiral spring was first used to drive a portable clock early in the 16th century. Mainsprings are usually made from hardened and tempered steel strip, although recently special alloy steel springs have become available, and these offer advantages such as greater resistance to breakage and more power for a given size over standard steel springs.
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- Part of Speech: noun
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- Industry/Domain: Chronometry
- Category: Clock
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