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The Encyclopedia of Horology

Component record · Train

Reset Hammer

Partially verified

Two-pronged hammer

What it does

Returns chronograph hands to zero

How it works

Evolution

Strikes the heart cams

Known variations

    Identification for collectors

      Common failure modes

      • Cracked arms

      Diagram

      driving wheelcoupling clutchcolumn wheelpusher
      Schematic: chronograph control. 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.