Watch Glossary
1676 horological terms explained · 4/6
Combined mechanical quartz/automatic movement with discrete smart sensor integration
Jewel on balance wheel that receives impulses from pallet fork escape wheel
Calibers designed and produced by watch brand, Omega 9300, Seiko 9R65, AP 3120 examples
Shock-absorption system using jeweled bearings to protect delicate balance staff from impacts.
Bilateral balance requirement of index regulator arms to prevent chronometric asymmetry.
Engineering technique removing mechanical play between index regulator components.
Mechanical resistance required to move index regulator arms during timing adjustment.
Total achievable rate correction span via index regulator adjustment before mechanical limits.
Numerical value representing resistance between the regulator pin and the hairspring lever.
Lag between index regulator movement command and actual hairspring length adjustment.
Rotational force required to move the timing lever from a fixed regulator pin position.
Critical measurement of the semicircular grooves on the regulator pin engagement surface.
Centered mechanical state of index regulator where hairspring length correction equals zero.
Thread specification controlling fine adjustment increments on index regulator mechanisms.
Examination of regulator pin surface abrasion to assess timing lever contact consistency.
Chronograph components built into base movement, Zenith El Primero and Omega 9300 examples
Zenith measurement of how column wheel integration affects rotor moment calculations
Gear wheel engaged by setting lever to allow independent time adjustment
In-house automatic, 70-hour reserve, chronometer certified, used in Atmos clocks
Synthetic ruby or sapphire bearing reducing friction at watch movement pivot points
Total number of synthetic ruby jewel bearings in a movement; more jewels typically reduce friction.
Metal-lined bearing holes that hold synthetic ruby jewels to reduce friction on pivots.
Synthetic rubies used as low-friction bearings for watch pivots and components.
Jaeger-LeCoultre's ultra-compact automatic movement at 23.2mm diameter, engineered for thin dress watches.
Mechanical system allowing crown to wind mainspring and set time without key
Swiss-made shock absorption system protecting pivots from mechanical damage and vibration.
Seiko's electromechanical movement converting automatic winding energy into electrical power.
Adjustable mechanical cam modifying sunrise-sunset calculation for geographic location
Chronograph movement, hand-wound, 50-hour reserve, Swiss precision for military watches
Component in the escapement mechanism that controls the release of energy to the balance.
Fine-tuning lever escapement drop distance to achieve optimal beat regularity.
Type of escapement using pallet fork and lever to regulate energy release to balance
Precise angular positioning of lever banking pins to optimize impulse transmission efficiency.
Mathematical definition of lever impulse surface angle relative to escape wheel center.
Measurement protocol verifying balanced geometry of lever pallet fork arms.
Quantification of minor play between lever and escape wheel teeth at rest.
Gear ratio correction accounting for 18.6-year lunar nodal precession cycle
Coiled metal ribbon that stores energy to power the entire watch movement.
Mechanical movement requiring manual winding via the crown to store energy in mainspring.
Measurement of intentional oval gear deviation in equation marchante mechanism
Seiko's hybrid movement combining quartz accuracy with mechanical automatic winding.
Engagement of teeth between two gears; critical for smooth power transmission
Chronometer-grade movement meeting U.S. military specifications for accuracy and shock resistance.
Military specification requiring 1,000+ wind cycles without degradation or brittleness.
Military specification mandating Incabloc or equivalent anti-shock mechanism for durability.
Military specification requiring movement to survive 50G impact without losing chronometer rating.
Caliber requirements for shock resistance, accuracy, and reliability in combat conditions.
Wheel rotating once per hour on cannon pinion, drives hour wheel in motion works
Meca-quartz hybrid, mechanical chronograph with quartz timekeeping, battery powered operation
Specific movement caliber selected and approved by British Ministry of Defence for issue.
Chronograph mounted on base movement, 7750 on 2824 base, allows customization
Watch stored for years with congealed oils; requires full service before operation.
Gear assembly converting center wheel rotation to hour wheel and minute wheel motion
Identifying unique wear signatures on caliber-specific components used to verify authentic movement installation.
Rolex's modern shock absorber protecting the balance wheel from impacts and vibrations.
Historic movement used in Speedmaster Professional, column wheel chronograph, hand-wound
In-house movement, dual barrels, 60-hour reserve, integrated chronograph mechanism
Master Chronometer certified, antimagnetic, 60-hour power reserve, chronograph capability
Omega's modern automatic movement with Master Chronometer certification and enhanced antimagnetic properties.
The balance wheel and hairspring assembly that regulates the watch's timekeeping rate.