Watch Glossary

Wireless system uploading software patches directly to wristwatch without dock connection

Omega specification for instant chronograph hand return mechanism in integrated movements

Balance wheel without index regulator, relying on hairspring geometry alone for rate adjustment.

Oil film maintenance requirement for friction-free balance wheel pivot rotation.

Allowable radial deviation of balance wheel center from hairspring attachment point.

Quantification of rate variance in a free-sprung balance across different oscillation amplitudes.

Maximum permissible horizontal deflection before free-sprung balance contacts limiting surfaces.

Rotational resistance measurement of balance wheel without hairspring moment contribution.

Specialized bearing cavity design for unsupported hairspring terminals in free-sprung balances.

Wobble frequency of balance wheel axis during oscillation in free-sprung configuration.

Permissible side-to-side movement in balance wheel without hairspring lateral support.

Numerical measure of how consistently a free-sprung movement maintains its beat rate over time.

Computational method predicting rate stability in free-sprung movements based on environmental parameters.

Gradual shift in the natural oscillation frequency of a free-sprung balance over extended service.

Method using hairspring material properties alone to counteract temperature-induced rate changes.

Number of oscillations per hour; determines movement precision and commonly rated in Hz.

Historical mechanism using a tapering cone to maintain constant torque as mainspring unwinds.