Slide rule�a device, consisting of logarithmic or other scales on the outer edge of the watch face, that can be used to do mathematical calculations. One of the scales is marked on a rotating bezel, which can be slid against the stationary scale to make the calculations. Some watches have slide rules that allow specific calculations, such as for fuel consumption by an airplane.
Flyback hand�a seconds hand on a chronograph (see �chronograph�) that can be used to time laps or to determine finishing times for several competitors in a race. Usually has two sweep second hands, one positioned above the other. When the timer is running, the hands appear as one. When the start/stop button is activated while the chronograph mechanism is running, one hand stops to record a lap time etc. and the other continues to run. Activating the start/stop button causes the hand to return to the original position in tandem with the running sweep hand.
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