Diagram for determining the angular radius of a rainbow
                                Date
                            
                            
                                24 November 1667
                            
                            
                        
                            
                            
                            
                                Object type
                            
                            
                            
                        
                            
                            
                            
                                Archive reference number
                            
                            
                            
                        
                            
                            
                            
                                Manuscript page number
                            
                            
                                p97
                            
                            
                        
                            
                            
                            
                                Material
                            
                            
                            
                        
                            
                            
                            
                                Dimensions
                            
                            
                                height (page): 313mm
width (page): 195mm
                            
                        
                            
                            
                            width (page): 195mm
                                Subject
                            
                            
                            
                        
                            
                            
                            
                                Description
                            
                            
                                Diagram for determining the angular radius of a rainbow that any fluid would produce. This demonstration was included in Renatus Franciscus Slusius's letter to Henry Oldenburg dated 24 November 1667 [N.S.], which was read to the Royal Society on 28 November 1667.
The diagram in the original letter is at EL/S1/51/003. There are other copies at EL/OB/70/004 and LBC/2/115.
                            
                            
                        
                            
                            
                            The diagram in the original letter is at EL/S1/51/003. There are other copies at EL/OB/70/004 and LBC/2/115.
                                Object history
                            
                            
                                At the meeting of the Royal Society on 28 November 1667, ‘Mr. Oldenburg produced a letter written to him by Renatus Franciscus Slusius, canon of Liege, dated there 24 November, 1667, N. S. giving an account of his method of reducing an equation of the fourth degree or biquadratic into two quadratic equations, by a circle and a parabola; and expressing his great respect to the society. It was ordered, that the secretary  should return him the thanks of the society, and that Mr. Hooke and Mr. Collins should have a copy of the letter to consider, whether Mr. Slusius had effected what he had undertaken’ (Birch 2:217-18). Oldenburg’s reply is dated 25 November 1667.
                            
                            
                        
                            
                            
                            
                                Related fellows
                            
                            
                                Renatus Franciscus Slusius (1622 - 1685, Belgian) , Mathematician
Henry Oldenburg (1612 - 1677, German) , Scientific correspondent
                            
                        
                            
                            
                            Henry Oldenburg (1612 - 1677, German) , Scientific correspondent
                                Associated place