Around 1847 , Jean-Adrien Philippe , co-founder of Patek Philippe, developed a movement with central independent dead seconds based on a Victorin Piguet & Cie ebauche . The center independent dead seconds hand can be activated on demand via a pusher locat...
1/5th second jumping-hand aka “diablotine”-also known as the FOUNDROYANTE-lightning seconds the HALF QUARTERS FOUDROYANTE on this split second chronograph from a book written by FRANCOIS LECOULTRE professor of geneva school of watchmaking independent beat...
As far as I've understood, the invention of Jean Adrien Philippe, which was patented in 1889, is that of an "independent seconds watch with two simultaneously wound barrels... and two wheel trains..."... Best, Emmanuel