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The Encyclopedia of Horology

Component record · Escapement

Impulse Jewel

Partially verified

D-shaped ruby

What it does

Transmits energy from fork to balance

How it works

Evolution

Critical for escapement function

Known variations

    Identification for collectors

      Common failure modes

      • Chipping

      Diagram

      escape wheelpallets and leveroscillator
      Schematic: escapement arrangement. An outline schematic drawn to show the arrangement of the parts discussed here. It is not a dimensioned working drawing and does not depict a particular maker's calibre.

      Sources & references

      1. de Carle, D., Practical Watch Repairing
      2. de Carle, D., Watch and Clock Encyclopedia
      3. Daniels, G., Watchmaking

      Where sources disagree, the disagreement is stated rather than resolved silently.