Paper, 'On six inventions' by Isaac de la Chaumette De la Chaumette shares six of his inventions: one concerning a bomb, an iron rod, a lock which is put into the wood of a door, a padlock that appears by combining numbers on the moveable hoops, a tin cartridge for charging a firelock and a stirrup to prevent falling from a horse. Subject: Engineering Read to the Royal Society on 9 May 1734 1734