Watch Glossary

Bridge component that supports upper balance wheel pivot and hairspring stud

Oscillating wheel that regulates timekeeping by vibrating at a constant frequency.

Precise calculation of the balance wheel's resistance to rotational acceleration.

Fixed pins limiting pallet fork swing to prevent excessive escape wheel engagement

Cylindrical drum containing the mainspring; core component of the movement's power system.

Machine learning system forecasting remaining battery life based on usage patterns

Circuit analyzing lithium-ion degradation to predict remaining battery lifespan

Number of oscillations the balance wheel completes per hour; common rates include 28,800 bph.

Standard measurement of balance wheel oscillations; higher rates generally indicate better precision.

Oscillation frequency specification, 7750 at 28,800 bph, El Primero at 36,000 bph

Power-efficient wireless connectivity standard for hybrid watch synchronization

Energy loss between successive oscillations due to internal friction within the terminal coil structure.

Precision method for maintaining consistent spacing between overcoil spiral layers.

Assessment of consistent spacing between successive turns of the terminal overcoil loop.

Controlled dimensional pressure keeping the outer loop in optimal geometric relationship to the spiral.

Energy dissipation characteristics inherent to the terminal coil configuration during oscillation.

Differential thermal expansion across overcoil structure affecting rate stability.

Precise measurement of the outer coil's endpoint curvature and lift angle in Breguet spirals.

Vertical clearance between overcoil's outer curve and balance cock at extrema.

Metal component spanning the plate providing additional support and bearing points for pivots.