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INTERIOR Movement�the inner mechanism of a watch that keeps time and operates the watch�s functions. Caliber�used to denote the size of a movement usually measured in lignes (2.256 mm); also used by manufacturers as �names� for their movements. Ligne�used to indicate the size of a mechanical movement, measured over the plate beneath the dial. 1 ligne = 2.256 mm (one twelfth of a �French inch�.) Ebauche�literally the basic frame; commonly used for an assembled movement, without escapement, balance and hairspring and mainspring. Mainspring�a coiled flat spring which provides the power to drive the gear train of mechanical watches. Balance wheel�an oscillator, which regulates or governs the speed of the movement. A flat ring which pivots on an axle. It must be perfectly poised. After it has swung one way, the spring at its center reverses it and makes it swing the other way �hence the �tick tock� of a mechanical watch. Both balance and hairspring are made of a special alloy to offset the effect of temperature changes. 
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