Paper, 'Description des nouvelles découvertes' [Descriptions of some new discoveries] by Isaac de la Chaumette De la Chaumette shares details of his inventions which include a window with shutters, square tiles, a 'cuckold for hindring the smoaking of chimneys more perfect than the plates...', a locked stopper, a double spring to a bayonet for better fastening to a musket and a door-spring to be used in place of weights and pulleys 'which are ugly and troublesome'. Subject: Engineering Read to the Royal Society on 28 April 1726 24 March 1726