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The Encyclopedia of Horology

Component record · Train

Minute Counter Jumper

Partially verified

The sprung lever indexing a chronograph minute counter.

What it does

Advances and holds the minute register one step per minute.

How it works

A finger on the chronograph runner trips the lever once per revolution, advancing the register, which the jumper then locates.

Evolution

Semi-instantaneous and instantaneous variants exist.

Known variations

  • Creeping counter
  • Jumping counter

Identification for collectors

  • A register sitting between marks points to a jumper fault.

Common failure modes

  • Weak spring
  • Worn indexing finger

Related photographs

Large Silver Swiss Centre Seconds Chronograph – 1894
Large Silver Swiss Centre Seconds Chronograph – 1894 — WatchMuseum.org, © WatchMuseum.org, used with permission. WatchMuseum.org catalogue record
Large Silver Swiss Centre Seconds Chronograph – 1894
Large Silver Swiss Centre Seconds Chronograph – 1894 — WatchMuseum.org, © WatchMuseum.org, used with permission. WatchMuseum.org catalogue record
Large Silver Swiss Centre Seconds Chronograph – 1894
Large Silver Swiss Centre Seconds Chronograph – 1894 — WatchMuseum.org, © WatchMuseum.org, used with permission. WatchMuseum.org catalogue record

No confidently matched photograph of this subject has been found yet. These photographs show a closely related record, and are not examples of the type described on this page.

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.