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...

Scope and Contents (1) Miscellaneous papers concerning geodesy pendulumsCorrespondence with Kew Observatory, 1874, concerning the correction of the sidereal clock and the extending of the period of transmission of time signals.Printed extract from Walker's report of the survey of India, 1874.Letter from W. Harkness of the U.S. Naval Observatory concerning pendulum swings at the Transit of Venus stations and asking what base stations to use, 1874.Correspondence with Captain...