Foudroyant is a French word meaning ‘striking as with lightning’, and a foudroyant jumping seconds hand is one that makes one rotation every second around the face of a watch to indicate the
This complication traditionally allows a chronograph to measure 1/8th or 1/6th of a second depending upon the balance vbh rate. A 28,800 or 21,600vph would determine whether or not it was 1/8th sec. or 1/6th sec. The Habrings rather like the movement of t...