Scope and Contents Correspondence relating to mirrors, micrometers and spectrophotometry, including the following material:Correspondence with J. Cooke and Sons on a speculum mirror, 1912.Correspondence with Troughton and Simms on a Duplex micrometer, 1910-1912.Correspondence with the Cambridge Instrument Co. and the National Physical Laboratory on spectrophotometry, 1926-1930.Correspondence concerning a new measuring micrometer for the Cookson Plates and a second micrometer,...

Scope and Contents The bulk of RGO 66 comprises the incoming and copy correspondence of the chief assistant, later superintendant, George Mathews Whipple during 1871-5. Much of it is with the chemist and astronomer Warren De La Rue whose photoheliograph was moved to and used at Kew in the early 1870s. The correspondence is largely concerned with solar photographs and the practicalities of their production. There are a few financial papers and some records of solar and lunar observations made both at Kew and...