|Flange, Flinque, Fluted, Fold-Over-Clasp, Fourth Wheel, Frequency, Fusee|
The usually inclined ring that separates the crystal from the dial. The flange is sometimes equipped with features such as tachymetric scales and pulsometers.
Engraving on the dial or case of a watch, covered with an enamel layer.
Said of surfaces worked with thin parallel grooves, mostly on dials or case bezels.
Feature combined with chronograph functions, that allows a new measurement starting from zero (and interrupting a measuring already under way) by pressing down a single pusher, i.e. without stopping, zeroing and restarting the whole mechanism. Originally, this function was developed to meet the needs of air forces.
A chronograph with a special dial train switch that makes the immediate re-use of the chronograph movement possible after resetting the hands. It was developed for special timekeeping duties (such as found in aviation), which require the measurement of time intervals in quick succession. A flyback may also be called a retour en vol.
Hinged and jointed element, normally of the same material as the one used for the case. It allows easy fastening of the bracelet on the wrist. Often provided with a snap-in locking device, sometimes with an additional clip or push piece.
The seconds wheel in going-train.
Vibration Generally defined as the number of cycles per time unit; in horology it is the number of oscillations of a balance every two seconds or of its vibrations per second. For practical purposes, frequency is expressed in vibrations per hour (vph).
A conical part with a spiral groove on which a chain or cord attached to the barrel is wound. Its purpose is to equalize the driving power transmitted to the train.