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The Encyclopedia of Horology

Component record · Train

Minute Jumper

Partially verified

Thin beak spring

What it does

Indexes the minute counter wheel

How it works

Evolution

Ensures crisp hand movement

Known variations

    Identification for collectors

      Common failure modes

      • Improper tension

      Diagram

      12345let downstripcleanoilregulateorder of work; never skip letting down the mainspring
      Schematic: order of work at the bench. 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.