Movement
A
- Adjusted to positionsAccuracy tested and evened out across several orientations of the watch
- AmplitudeHow far a watch's balance wheel turns on each swing, given as an angle in degrees
- AntimagneticA watch built to keep running with only small errors when exposed to magnetic fields
- AutomaticA mechanical watch whose mainspring is wound by the wearer's own movement
- Automatic quartzA quartz movement powered by a self-winding rotor instead of a battery
B
- Balance cockBridge fixed at one point that holds the upper pivot of the balance from above
- Balance wheelWeighted wheel that swings back and forth to keep time in a mechanical watch
- BarrelToothed metal drum that holds the mainspring and powers a mechanical watch
- Beat errorThe time difference between the two halves of a balance's swing
- Bidirectional windingSelf-winding system in which the rotor produces energy whichever way it turns
- Breguet overcoilHairspring whose outer coil is raised into a second plane so it breathes more evenly
- BridgeMetal plate, fixed at both ends, that holds the pivots of a watch's wheels
C
- Cam-actuated chronographChronograph switched by a sliding or pivoting shaped cam instead of a column wheel
- Cap jewelAn unpierced jewel that limits how far the balance staff can move along its axis
- ChatonSmall metal ring that holds a jewel bearing in place in a mechanical movement
- Co-Axial escapementGeorge Daniels's modern watch escapement that almost entirely removes sliding friction
- Column wheelPillared control wheel that sets which chronograph levers can move
- Constant forceEscapement that gives the balance equal impulses however wound the mainspring is
- Crown wheelToothed wheel that carries winding torque from the crown to the ratchet wheel
- Cylinder escapementA watch escapement using a cut-away cylinder on the balance shaft instead of pallets
D
E
- ÉbaucheAn unfinished watch movement that specialist firms sell for other brands to complete
- ElinvarNickel, iron and chromium alloy whose springiness barely changes with temperature
- Escape wheelThe last wheel in a movement, released tooth by tooth by the escapement
- EscapementThe linkage that pushes a watch's timekeeping part and releases the gears step by step
- ETASwiss maker of mechanical movements, ébauches and quartz watches
F
G
H
I
J
L
M
- MainspringCoiled metal spring that stores energy and powers a mechanical watch
- Maintaining powerDevice that keeps a clock or watch running while it is being wound
- Manual windingMechanical movement whose mainspring the owner winds by hand using the crown
- ManufactureA watch factory that makes its watches, and their movements, almost entirely itself
- Meca-quartzHybrid watch movement with quartz timekeeping and a mechanical chronograph
- MovementThe working mechanism inside a watch or other timepiece