Watch Glossary
1676 horological terms explained · 1/2
Dial scale measuring speed based on distance traveled, primarily used on racing chronographs.
Scale on bezel used to measure speed based on distance traveled.
Graduated scale measuring speed based on distance and time elapsed.
Simple pin-style buckle that fastens through a leather or fabric strap.
Cartier's rectangular dress watch inspired by military tanks, since 1917
Rectangular case design inspired by military tanks, featuring distinctive curved sides and lugs.
Gemstone setting that decreases in width from stone to mounting base.
The number of tapisserie grid cells per millimeter of dial surface.
Tolerance specification for horizontal-vertical line intersections in tapisserie patterns.
Consistency of width in tapisserie pattern lines across entire dial.
Perfect 90-degree crossing angle requirement between tapisserie horizontal and vertical lines.
Woven textile-inspired dial finish with interlocking geometric lines creating fabric-like appearance.
Depth variation in woven pattern creating natural light-and-shadow visual effect.
Smaller tapisserie-finished subsidiary dial used in chronograph or calendar complications.
Center reference line maintaining geometric balance of woven pattern across dial face.
The spacing ratio between horizontal and vertical lines in tapisserie dial patterns.
Assessment of caseback seal material breakdown affecting water resistance warranty.
Scale calculating distance based on time delay between light and sound
Bezel with telemeter scale measuring distance based on sound and light propagation differences
Scale calculating distance based on sound propagation and light timing.
Mechanism to counteract effects of temperature changes on timekeeping accuracy
Controlled heating and cooling of steel to achieve desired hardness and resilience properties.
Fine-tuning of mechanical tensions in watch movement for optimal performance
Modern technique where gemstone appears suspended between two metal bands.
Standardized procedures by COSC for evaluating chronometer precision and reliability
Vintage dial featuring printed brand or model information; presence affects collector desirability.
Light reflection differential between raised pattern elements and base dial surface.
Conservation technique for refinishing worn pattern details on vintage dial surfaces.
Electronic adjustment system maintaining quartz accuracy across temperature variations
Advanced quartz movement with temperature compensation for superior chronometric stability.
Integrated scale displaying ambient temperature, typically placed on the dial edge or subsidiary dial.
Intermediate wheel in gear train that transfers power between barrel and center wheel
Case construction with separate middle, caseback, and crystal components assembled together.
Minute repeater chiming hours, quarter hours, and minutes when respective pushers are activated individually.
Design featuring three principal gemstones, often representing past, present, future.
Specialized gear train modeling lunar orbital eccentricity affecting tidal amplitude
Specialized subdial displaying tidal current strength as percentage of maximum range
Specialized hand displaying rotational direction of tidal flow vector
Specialized low-torque jeweled bearing supporting tide wheel with minimal drag
Secondary gear wheel modifying tidal amplitude indication based on lunar phase
Mechanical escapement synchronizing tidal maximum-minimum display with lunar transit
Displays tidal information based on lunar cycles, useful for maritime and sailing activities.
Articulated mechanical linkage connecting lunar position wheel to tidal display wheel
Mechanical linkage synchronizing tide indicator wheel with lunar orbital periodicity
Dial with distinctive turquoise/Tiffany blue color, iconic Rolex collectible variant.
Tool that analyzes watch beat, amplitude, and rate in real-time.
Maximum allowed variation in seconds per day certified by COSC standards
Fixed outer bezel marking specific time intervals for dive planning.
Automatic time adjustment system utilizing GNSS and network data for accuracy across regions
Electronic device that measures watch rate and performance parameters.
Real-time measurement of balance wheel amplitude loss over 30-60 second intervals during diagnostics.
Algorithmic correction accounting for barometric pressure effects on acoustic beat measurement
Advanced filtering algorithm distinguishing true beat error from external vibration interference signals.
Maximum allowable deviation in microseconds between escapement impulses for acceptable regulation
Reference standard component used to verify accuracy and sensitivity of timing machine sensors.
Electronic component isolating rate information from movement vibrations in precision timing devices.
Precision quantification of lever lock engagement period in escapement cycle analysis
Digital circuit in timing machines measuring escapement frequency in oscillations per hour with precision.
Advanced diagnostic function revealing harmonic disturbances and escapement irregularities in movement operation.
Digital signal processing feature eliminating extraneous vibrations in beat rate measurement