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 RGO 67 largely consists of a good run of contact prints from glass plate negatives of the sun produced between January 1862 and January 1872. The most significant breaks are December 1862-May 1863 and August-September 1872. Additionally there are a handful of glass plate negatives and contact prints produced in 1858-9, and one further negative dated 1866. The sequence of images is essentially continued by RGO 51: RO and RGO Solar Plates Contact Prints.

Scope and Contents RGO 57 contains drawings of sunspots showing their development, size and grouping, with tables recording the number of sunspots for each year.

Scope and Contents RGO 58 contains copies of drawings by H.S. Schwabe showing the location and grouping of sunspots during 5 November 1825 to 29 December 1867. The copies were made at the Kew Observatory, February- April 1880. They were traced by several different people and indexed and checked by H. McLaughlin and the Superintendent, G.M. Whipple. Each volume includes notes recording poor weather conditions, days when observations were not made and other information. There are also tables summarising the results...