Double-keel vessel
                                Date
                            
                            
                                1685
                            
                            
                        
                            
                            
                            
                                Creator
                            
                            
                                Unknown, Artist
                            
                            
                        
                            
                            
                            
                                After
                            
                            
                                William Petty (1623 - 1687, British) , Natural philosopher
                            
                            
                        
                            
                            
                            
                                Object type
                            
                            
                            
                        
                            
                            
                            
                                Archive reference number
                            
                            
                            
                        
                            
                            
                            
                                Manuscript page number
                            
                            
                                p2
                            
                            
                        
                            
                            
                            
                                Material
                            
                            
                            
                        
                            
                            
                            
                                Dimensions
                            
                            
                                height (page): 406mm
width (page): 316mm
                            
                        
                            
                            
                            width (page): 316mm
                                Subject
                            
                            
                            
                        
                            
                            
                            
                                Content object
                            
                            
                            
                        
                            
                            
                            
                                Description
                            
                            
                                A drawing of William Petty's 'Double-Keel Vessell' (catamaran) on a single sheet of paper, setting out in twelve points the advantages of the design, including its ability to sail without a ballast (and thus enter shallow waters).
                            
                            
                        
                            
                            
                            
                                Transcription
                            
                            
                                The Description & Excellency of the Double-Keel Vessell
Transcribed by the Making Visible project
                            
                        
                            
                            
                            Transcribed by the Making Visible project
                                Object history
                            
                            
                                This may have accompanied the dedication in 1685 of a double-keeled model, now in the Royal Society (Henry William Edmund Petty FitzMaurice Lansdowne, The Double Bottom or Twin-Hulled Ship of Sir William Petty (Oxford: the Roxburghe Club, 1931), p. xvii).
At the meeting of the Royal Society on 29 July 1685, ‘A curious model of a double bottomed ship was presented by Mr. Houghton in the name of John Worlidge of Petersfield, which had been made some years before by his brother, Mr .Worlidge, a gold-smith at Portsmouth. A paper of the description and excellency of the vessel being read was sent with it to the repository, being first entered in the letter-book [not entered in LBO]’ (Birch 4:423-24).
                            
                        
                            
                            
                            At the meeting of the Royal Society on 29 July 1685, ‘A curious model of a double bottomed ship was presented by Mr. Houghton in the name of John Worlidge of Petersfield, which had been made some years before by his brother, Mr .Worlidge, a gold-smith at Portsmouth. A paper of the description and excellency of the vessel being read was sent with it to the repository, being first entered in the letter-book [not entered in LBO]’ (Birch 4:423-24).
                                Related fellows
                            
                            
                                John Houghton (1645 - 1705, British) , Merchant
William Petty (1623 - 1687, British) , Natural philosopher
                            
                        
                            
                            
                            William Petty (1623 - 1687, British) , Natural philosopher
                                Associated place