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verge escapement

device
Also known as: verge-and-foliot escapement

Quick Summary

The verge escapement is a mechanical device that controls the movement of a clock or watch, allowing energy from a power source to be transferred to the counting mechanism in controlled, step-like motions. It was likely invented in 13th-century Europe and is considered the classic form that made mechanical clocks possible.1

This escapement consists of a crown wheel, driven by a weight, that is repeatedly stopped by two metal pallets. These pallets are attached to a verge, a vertical shaft. The speed of the verge's oscillation is regulated by a foliot, a crossbar with small weights; moving these weights outward slows the oscillations. The verge escapement was a significant invention, though it was later improved upon by mechanisms like the anchor escapement.1

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2 Britannica Sources
  1. escapement
  2. clock

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