Letter, from Hugh Percy (3rd Duke of Northumberland) to Sir John Herschel, dated at Cowes Autographed letter . Agrees with John Frederick William Herschel to go direct to the French optician [see John Frederick William Herschel's 1833-8-9] for a large object glass; HP will provide a telescope with such a lens if G. B. Airy agrees such a large telescope is appropriate to Cambridge Observatory. 12 August 1833