Copy letter, from Sir John Herschel to Edward Sabine Copy of letter, copied as part of the correspondence project led by Colonel John Herschel FRS following the death of his father. On 1825-4-7 presented Edward Sabine's proposal for experiments at Teneriffe to the Board of Longitude, which judged the experiments not sufficiently relevant to the Board's concerns. Offers to seek endorsement from the Royal Society [of London] 8 April 1825