Watch Glossary

Quality control procedure verifying Breguet overcoil radius uniformity across full circumference.

Mathematical alignment angle where Breguet overcoil terminal meets hairspring plane.

Breguet overcoil design feature minimizing rate variations across amplitude spectrum.

Natural oscillation rate of Breguet overcoil structure independent of balance wheel.

Measurement of resistance to flexing in a Breguet overcoil's terminal curve.

Component that engages escape wheel teeth to control gear train release

Jewel on pallet fork engaging escape wheel teeth for impulse transmission

Rolex's blue alloy hairspring resisting temperature changes and magnetic fields effectively.

Rolex innovation, paramagnetic alloy, temperature resistant, used in 3135 and 3235

Rolex specification measuring resistance to magnetic field interference in Parachrom alloy

Alloys resistant to magnetism, Parachrom hairspring in Rolex, alloy balance wheels

Golden Ellipse exclusive, hand-wound, ultra-thin, 48-hour reserve, haute horlogerie standard

Slender, elongated hand design typical of 1960s minimalist watches.

Rolex's automatic winding mechanism using a free-spinning rotor

Rate of change in balance wheel amplitude relative to temperature fluctuations.

Detailed analysis of varying spring constant along Phillips curve length.

Secondary vibrational modes induced by Phillips curve geometry during oscillation.

Transition zone where Phillips curve curvature changes direction within hairspring coil.

Deviation from predicted rate behavior due to Phillips curve geometric complexity.

Measurement of deviation from theoretical hairspring stiffness predictions across the operating spectrum.

Adjustment method mapping hairspring stiffness against frequency stability across temperature ranges.

Proportional relationship between Phillips curve arc radius and hairspring wire diameter.

Graphical representation of hairspring rigidity versus frequency response across environmental conditions.

Localized material stress points created by Phillips curve directional change.

Lag effect observed in hairspring behavior when temperature increases versus decreases.

Directional control exerted by Phillips curve on hairspring final outer coil trajectory.

Small gear with fewer teeth, typically fixed to wheel shaft for gear meshing

Thin shaft extending from watch gears that rotates in jeweled bearings to reduce friction.

Base structural component of the movement holding bridges, jewels, and gear pivots in place.

Fine-tuning of movement rate to account for accuracy differences in various wearing positions.

Duration the watch continues running after being fully wound without additional energy input.

Smartwatch operating system architecture managing app alerts and message delivery

Electronic movement using vibrating quartz crystal regulated by a battery for timekeeping.

Toothed wheel in the winding mechanism that prevents mainspring from unwinding during manual winding.

Proportion of gear teeth determining speed reduction between successive gear stages

Measurable side-to-side movement of the timing lever pin within its mounting point.

Design feature minimizing transmission of external vibrations to the hairspring timing mechanism.

Permissible gap between the regulator pin and the hairspring timing lever contact surface.

Intermediate wheel system providing constant force and regulating energy from the mainspring.

Perpetual rotor, Parachrom hairspring, 48-hour power reserve, widely used in sports watches

Evolved 3135 with Chronergy escapement, 70-hour power reserve, improved efficiency

GMT-Master II exclusive, dual time module, 70-hour reserve, Chronergy escapement

Proprietary automatic winding system in Caliber 3135, featuring bidirectional winding and optimized energy transfer.

Weighted oscillating component in automatic watches that winds the mainspring via wrist motion.

Hand-wound movement, 40-hour power reserve, robust construction for field watches

Hand-wound, 50-hour reserve, reliable workhorse for Prospex line, accurate regulation

Simple automatic, 41-hour reserve, iconic in Submariner homage watches, proven durability

Grand Seiko in-house movement, 72-hour reserve, high accuracy, hand-wound precision

Automatic, 40-hour reserve, hacking seconds, day-date complications, affordable reliability

Seiko's proprietary quartz-mechanical hybrid movement with magnetic braking, eliminating watch tick.

ETA 2824 alternative, 42-hour reserve, Swiss-made, compatible chronograph calibers available

Chronograph movement based on 7750, 42-hour reserve, Swiss manufacture, column wheel

Component that engages intermediate wheel to enable time-setting mode in keyless works

Gear reduction factor establishing sidereal hour hand rotation versus mean solar time

Precision hairspring tension adjustment calibrating sidereal timekeeping accuracy

Annual mechanical adjustment compensating for 20-minute sidereal-tropical year variance

Gear with non-standard tooth count creating cumulative time differential display

Hairspring made from silicon, offering improved precision and resistance to temperature variations.

Watch movement powered directly by solar panels, requiring no battery replacement.

Rolex's silicon hairspring and balance wheel assembly for enhanced chronometric performance.