Interactive tools
Calculators & references
Every calculation runs in your browser. See the Simulation Lab for animated models.
Beat-rate converter
= 4 Hz
= 18,000 vph
Accuracy calculator
Rate: 6.00 s/day
COSC chronometer: −4 / +6 s/day
Lignes ⇄ millimetres
= 25.94 mm
= 13.30'''
Power reserve
≈ 48.8 h (theoretical)
Multilingual glossary
Consistent terminology across languages. More languages are being reviewed by specialist translators.
| Term | Definition | Français | Deutsch |
|---|---|---|---|
| Calibre | A specific movement design, usually identified by a maker's number. | Calibre | Kaliber |
| Ligne | Traditional French unit of movement size, ≈ 2.2558 mm. | Ligne | Linie |
| Escapement | Mechanism that releases the train's energy in regular steps and impulses the oscillator. | Échappement | Hemmung |
| Balance spring | Spiral spring governing the balance's period; also hairspring. | Spiral | Unruhspirale |
| Hunter case | Pocket watch case with a hinged lid covering the dial. | Savonnette | Sprungdeckel |
| Redial | A dial that has been refinished or reprinted after original manufacture. | Cadran refait | Restauriertes Zifferblatt |
| vph | Vibrations (half-oscillations) per hour; 28,800 vph = 4 Hz. | A/h (alternances par heure) | A/h (Halbschwingungen pro Stunde) |
| Complication | Any function beyond hours, minutes and seconds. | Complication | Komplikation |
| Fusee | Cone pulley equalising mainspring torque. | Fusée | Schnecke |
| Jewel | Synthetic ruby bearing reducing friction at pivots. | Rubis | Stein |