Copy of a letter, from John Frederick William Herschel to Richard Sheepshanks, dated at 32 Harley St. Copy of letter, copied as part of the correspondence project led by Colonel John Herschel FRS following the death of his father. As the Kew Observatory needs a standard yard, John Frederick William Herschel is proposing that they be allowed to use one of Richard Sheepshanks's as a provisional standard until Parliament acts. 5 November 1851