Manuscript, 'A scheeme of the longitude, or a peice of watche worke of new construction that shal goe upon sae as reguler as the best pandulum clock shal goe upon land' by Laurans 'A scheme of the longitude or a piece of watch work of new construction that shall go upon sea as regular as the best pendulum clock shall go upon land'. Laurans explains his design for a clock to be used at sea without a pendulum. Subject: Engineering Read to the Royal Society on 19 October 1721 14 July 1721