Watch Glossary

Secondary spring reducing oscillation in balance wheel assembly

Measurement specifying date disc component dimensions

Displays day and date, common in NH35 and mid-tier movements, adds mechanical complexity

Component disengaging chronograph mechanism when pusher released

Measurable flex distance of deadbeat anchor legs under impulse force application.

Acceptable variance in locking position angle for deadbeat escapement precision chronometry.

Critical contact surface area between deadbeat anchor slide and locking block.

Temperature-related accuracy variance scaling factor specific to deadbeat chronometer mechanisms.

Engagement depth between escape wheel and pallet fork affecting timekeeping stability

Precise angular measurement at which chronometer detent releases from locking position.

Critical polish quality of chronometer detent locking surface affecting performance stability.

Material property measurement determining detent spring's resistance to flexing in chronometer escapements.

Predictive metric evaluating chronometer detent spring fatigue resistance over service life.

Process of setting optimal initial spring tension in chronometer detent mechanisms.

Escapement design delivering impulse directly to the balance wheel, reducing energy loss.

Angular clearance allowing pallet fork to separate from escape wheel teeth

Two mainsprings in series, increases power reserve, common in chronograph movements like 9300