Diagrams
                                Date
                            
                            
                                25 April 1656
                            
                            
                        
                            
                            
                            
                                Creator
                            
                            
                            
                        
                            
                            
                            
                                Object type
                            
                            
                            
                        
                            
                            
                            
                                Archive reference number
                            
                            
                            
                        
                            
                            
                            
                                Manuscript page number
                            
                            
                                p8a
                            
                            
                        
                            
                            
                            
                                Material
                            
                            
                            
                        
                            
                            
                            
                                Dimensions
                            
                            
                                height (page): 69mm
width (page): 155mm
                            
                        
                            
                            
                            width (page): 155mm
                                Subject
                            
                            
                            
                        
                            
                            
                            
                                Description
                            
                            
                                This is the neat version of Cl.P/2/5/002.
This is a little-known work on optics by Johannes Hudde (1628-1704) called Specilla Circularia and dated 1656.
Its provenance is unclear, but it may be related to the interest among the members of the Royal Society and its correspondents in lenses and their optical properties.
For example, in a letter to Henry Oldenburg from 21 June 1677, Leibniz mentions visiting Hudde at Amsterdam in November 1676; Hudde claimed that he could 'describe a curve that is analytical or conforming to some constant equation which shall trace the profile of the face of some known individual'. (The Correspondence of Henry Oldenburg, ed. by Hall and Hall, vol. 13, pp. 303-14.)
                            
                            
                        
                            
                            
                            This is a little-known work on optics by Johannes Hudde (1628-1704) called Specilla Circularia and dated 1656.
Its provenance is unclear, but it may be related to the interest among the members of the Royal Society and its correspondents in lenses and their optical properties.
For example, in a letter to Henry Oldenburg from 21 June 1677, Leibniz mentions visiting Hudde at Amsterdam in November 1676; Hudde claimed that he could 'describe a curve that is analytical or conforming to some constant equation which shall trace the profile of the face of some known individual'. (The Correspondence of Henry Oldenburg, ed. by Hall and Hall, vol. 13, pp. 303-14.)
                                Transcription
                            
                            
                                p. 1: Specilla Circularia, sive Quomodo per solas figuras circularos fieri possint omnis generis specilla, tam Microscopia quam Telescopiacum eundem effectum habentia, aut saltem quam proxime accedentem ad eorum, quae Ellipticas aut Hyperbolicas figuras fieri possent.
Transcribed by the Making Visible project
                            
                        
                            
                            
                            Transcribed by the Making Visible project
                                Object history
                            
                            
                                The tract is by Johannes Hudde (1628-1704), and a printed version is available at: https://www.kb.nl/themas/boekgeschiedenis/specilla-circularia-johannes-hudde-over-telescopen.
                            
                            
                        
                            
                            
                            
                                Associated place