Complication · Timing
Vertical Clutch Chronograph
Partially verifiedA method of engaging the chronograph train using vertical friction instead of lateral gears.
Definition
A method of engaging the chronograph train using vertical friction instead of lateral gears.
Historical origin
Developed to eliminate the 'jump' of the seconds hand when the chronograph is started.
How it works
Two discs are pressed together vertically to transmit power.
Eliminates the backlash associated with horizontal meshing gears.
Pocket watch context
None.
Wristwatch context
The modern standard for high-end automatic chronographs (e.g., Rolex 4130, Patek Philippe CH 29-535).
Identification
- Chronograph seconds hand starts perfectly smoothly
- No visible horizontal engagement lever
Servicing notes
Requires precise adjustment of the clutch tension; specialized tools often needed.
General guidance only. Complicated mechanisms should be assessed and serviced by a qualified watchmaker or clockmaker specialist, not adjusted at home.
Related photographs
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
- de Carle, D., Watch and Clock Encyclopedia
- Britten, F. J., Old Clocks and Watches and Their Makers
- Horological Journal (British Horological Institute), technical articles
Where sources disagree, the disagreement is stated rather than resolved silently.