Autograph Letter Signed, to J.G.Jeffreys, offering him the post of local Treasurer at the meeting of the British Association at Swansea. A good one page example, 7 x 4½ inches. Jeffreys’ draft acceptance reply on verso. Woolwich, 16 August 1847. General Sir Edward Sabine (1788-1883), physicist, soldier and explorer; astronomer to expeditions of John Ross (1818) and William Edward Parry in search of the Northwest Passage (1819-20). Sabine researched terrestrial magnetism. He was joint commissioner with Sir John Herschel acting with the French commission to determine the difference in longitude between Paris and Greenwich. John Gwyn Jeffreys (1809-1885), conchologist, author of British Conchology, 5 vols. 1862-69.