Drawings, ribs and chocks in merchant ships by [Robert Seppings?] Plate 8, figures 1-2 containing two illustrations showing the curvature of timber and a chock or wedge piece positioned to join a vessel's rib. The work is inscribed with publication and plate details. Not signed. Royal Society stamp verso. Subject: Engineering Published in Philosophical Transactions as part of paper titled 'On a new principle of constructing ships in the mercantile navy' by Robert Seppings. Read to the Royal Society on 9 March 1820. [1820]