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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.

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

Sources & references

  1. Ficklin, J., published research on Louis Moinet's 1816 compteur de tierces
  2. INPI archival index (existence of Rieussec filing noted, number not independently verified here)

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