LIFT. The angle through which the lever travels (in the lever escapement) during the impulse and escaping action. Lift may be divided between the pallets and the escape wheel teeth (the club-tooth) or be all on the pallets (pointed escape wheel teeth) or all on the teeth (with pointed pallets).

LIGNE. Also Line. A French and Swiss unit of measurement for indicating the size of a movement. A ligne = 2x25 mm.

L0CK (ING). The period between impulse when the train is locked and the balance is completing its oscillation, in either direction - i.e. during its supplementary arc (q, v.).

LOCKING PLATE. See COUNT WHEEL.

LUNETTE. A rounded watch glass, only slightly domed.