[MANUSCRIPT -- LONGITUDE]. Autograph manuscript, Copenhagen, 15 May 1767. 8 pages with integral blank, 34 lines per page, folio, WITH ORIGINAL RED WAX SEAL AND GREEN SILK CORDS, slight browning, in French. A report, including diagrams and calculations, of the method for determining longitude on land or at sea, presented by "le sieur Schultz" to the Acadmie Royale des Sciences, Paris. One of a number of 18th-century attempts to resolve this age-old problem.