Skip to content
The Encyclopedia of Horology

France · Rieussec French patent granted 1822 for a device demonstrated in 1821

Chronograph Mechanism (Column Wheel and Later Cam-Lever Control)

Partially verified

The chronograph became indispensable to sport, science, motoring, aviation and eventually spaceflight timing, and remains one of the most collected complication families.

Nicolas Rieussec's 'chronographe' used an inked wheel to mark elapsed time on a rotating dial, and is the device that gave the chronograph its name; Louis Moinet's earlier 'compteur de tierces' (rediscovered and publicised in the 2010s) predates it but was not a commercial product.

The column-wheel start/stop/reset control developed through the nineteenth century, later joined by the cheaper cam-lever ('lateral clutch') control mechanism used in mass-produced chronograph calibres.

Background

Louis Moinet is credited with the invention of the chronograph in 1816, a device initially designed for tracking astronomical objects. The first commercialized chronograph was later developed by Nicolas Mathieu Rieussec in 1821 at the request of King Louis XVIII. The device was originally developed to assist the King in measuring the duration of horse races.

Rieussec's design utilized a needle and an ink pool to record elapsed time by dragging a line of ink in a circular motion on a rotating face. Historically, Rieussec was recognized as the inventor of the chronograph until the discovery of Moinet's pocket timepiece in 2013 prompted a historical revision.

Written from the encyclopedia entries listed under Sources; each statement was checked against the cited text.

How it works

  • The mechanism includes pushers typically located near the crown to start, stop, and reset the stopwatch function.
  • Early models often utilized two faces, with one containing a pool of ink and the other holding a pen-like needle for recording.

Later history

  • Adolphe Nicole introduced an updated version in 1844 that allowed for the resetting of the mechanism to perform successive measurements.
  • The aviation industry accelerated the adoption of chronographs in the early 20th century due to the need for rapid calculations and precise timing.

How to verify this yourself

Rieussec's French patent should be sought in the INPI historical archive under his name and the 1821–1822 filing window; claims about Moinet's 1816 device rest on a documented instrument published by researcher Jordan Ficklin and Moinet specialists, not a patent record, since it long predates any formal chronograph patent and was not commercialised.

Manufacturers known to have used it

  • Breguet (early ébauche work)
  • Longines
  • Heuer/TAG Heuer
  • many later column-wheel and cam-lever manufacturers

Photographs

Pocket Chronograph (48709445542)
Pocket Chronograph (48709445542) — Auckland Museum Collections from Auckland, Aotearoa New Zealand, CC BY 2.0. Wikimedia Commons file page
Pocket Chronograph (48708940993)
Pocket Chronograph (48708940993) — Auckland Museum Collections from Auckland, Aotearoa New Zealand, CC BY 2.0. Wikimedia Commons file page
Pocket Chronograph (48709439862)
Pocket Chronograph (48709439862) — Auckland Museum Collections from Auckland, Aotearoa New Zealand, CC BY 2.0. Wikimedia Commons file page

Photographs are illustrative examples of the type, not necessarily the exact object described. Verify details against the source file page.

Sources & references

  1. Chronograph, Wikipedia (English), retrieved 2026-10-28 (text CC BY-SA 4.0)
  2. Ficklin, J., published research on Louis Moinet's 1816 compteur de tierces
  3. INPI archival index (existence of Rieussec filing noted, number not independently verified here)

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