Watch Related Terms & Terminology

Term Definition

The attraction exerted by Earth on all bodies. Its value is defined by the acceleration it causes in a free falling body.


The science and study of time measurement, the art of manufacturing or repairing timepieces.


Energy transferred to the balance or pendulum to maintain it in oscillation.


Electronic procedure for fine tuning a quartz watch without modifying the specific frequency of the quartz, periodically (every 60 seconds) adapts the moment of electrical impulse to the motor, correcting the display.


A metal alloy comprised of about 36% nickel, 64% iron, having a very low coefficient of expansion. Comes from the word “invariable”


Condition when time taken for 1 vibration remains the same, regardless of amplitude.


A Synthetic material used to make a modern watch movement’s bearings – These synthetic Rubies are almost as hard as diamonds. The “Jewels” reduce friction and maintain the properties of the oil longer.

Kinetic Energy

Energy possessed by a body in motion.


When the amplitude of a balance wheel exceeds 315 degrees, the roller jewel may strike the horn of the pallet fork at the end of the supplementary arc.

Lift Angle

The angular distance which the roller jewel makes contact with the pallet fork.


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