Unusual Forms of Mainspring
A mainspring is usually a coiled metal spring, however there are exceptions:
- The wagon spring clock: During a brief time in American clockmaking history coilable spring steel was not available in the USA and inventive clockmakers built clocks powered by a stack of leafsprings, similar what has traditionally served as a suspension spring for wagons.
- Other spring types are conceivable and have been used occasionally on experimental timepieces, such as e.g. torsion springs.
- Occasionally one finds an odd clock with a spring made of material other than metal, such as e.g. synthetic elastic materials.
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