Descriptions of some mechanical inventions - a spring to avoid any shipwreck that might be caused by stormy weather - a watch to be wound up by the ring so that no dust can enter it - a cannon to be charged at the breech - a pair of spectacles made to spring out of the case with an easy spring - a pair of buckles of a single piece without any tongues All with figures in text Read to the Royal Society on 4 February 1724 1724