Copy letter, from Sir John Herschel to George Biddell Airy, dated at Collingwood Contemporary copy in sender's hand, signed by sender. Has received a request from the Admiralty to order a new telescope for the Cape observatory; at the same time, John Frederick William Herschel has received an unsolicited offer of a lens. John Frederick William Herschel seeks advice and information from George Biddell Airy. 16 August 1843