Instrument to measure the velocity of falling bodies
                                Date
                            
                            
                                29 August 1664
                            
                            
                        
                            
                            
                            
                                Creator
                            
                            
                                Unknown, Artist
                            
                            
                        
                            
                            
                            
                                After
                            
                            
                                Christiaan Huygens (1629 - 2006, Dutch) , Natural philosopher
                            
                            
                        
                            
                            
                            
                                Object type
                            
                            
                            
                        
                            
                            
                            
                                Archive reference number
                            
                            
                            
                        
                            
                            
                            
                                Manuscript page number
                            
                            
                                vol1 p214
                            
                            
                        
                            
                            
                            
                                Material
                            
                            
                            
                        
                            
                            
                            
                                Dimensions
                            
                            
                                height (page): 300mm
width (page): 180mm
                            
                        
                            
                            
                            width (page): 180mm
                                Subject
                            
                            
                            
                        
                            
                            
                            
                                Content object
                            
                            
                            
                        
                            
                            
                            
                                Description
                            
                            
                                A copy of the figure of an instrument to measure the velocity of falling bodies drawn by Christian Huygens in his letter to Robert Moray dated 29 August 1664. The letter was read at the Royal Society's meeting on 31 August 1664, when it was noted that it was similar to the one designed by Robert Hooke (Cl.P/20/12/001), which Huygens had not yet seen.
This image is copied from LBO/1/185. The original image is at EL/H1/35/004. There is another copy at EL/H1/36/003.
                            
                            
                        
                            
                            
                            This image is copied from LBO/1/185. The original image is at EL/H1/35/004. There is another copy at EL/H1/36/003.
                                Object history
                            
                            
                                At the meeting of the Royal Society on 31 August 1664, ‘[Sir Robert Moray] produced a letter of Mons. Huygens, dated at the Hague, 29 Aug. 1664, N. S, mentioning an instrument devised by him for measuring the velocity of descending bodies (which was found not much different from that of Mr. Hooke invented before) as also, a new observation concerning Saturn, made the last spring at Rome, by one Campani, viz. that the circle of Saturn had covered a part of its sphere above, and had been covered thereby below, even with a little shadow upon the circle below, and upon the sphere above’ (Birch 1:464).
                            
                            
                        
                            
                            
                            
                                Related fellows
                            
                            
                                Christiaan Huygens (1629 - 2006, Dutch) , Natural philosopher
Robert Moray (1608 - 1673, British) , Natural philosopher
                            
                        
                            
                            
                            Robert Moray (1608 - 1673, British) , Natural philosopher
                                Associated place