Copy of draft letter, from Sir John Herschel to John P. Gassiot, dated at Collingwood Copy of draft letter, copied as part of the correspondence project led by Colonel John Herschel FRS following the death of his father. Comments on Royal Society [of London] acquiring Kew Observatory building for creation of magnetic observatory [see John P. Gassiot's 1871-2-13]. 17 February 1871