Foudroyante (Jumping seconds or hand) (Flying seconds)
(In French: seconde foudroyante)
On a chronograph , a hand that makes one rotation every second, pausing four, five, even eight times to indicate quarters, fifths or eighths of a second. Also called foudroyante. A foudroyante uses a small dial that is marked 0-8. The hand on the dial completes a sweep every second which is an elapsed time of 1/8th of second for each number. Not many brands today feature a foudroyante in their current collections as it is an uncommon complication which measures time at one eighth of a second.
Some that do: Panerai 246, Graham Foudroyante, Girard-Perregaux Scuderia Ferrari Foudroyante Rattrapante