SAYER, Robert. A New General Chart of the Atlantic or Western Ocean and adjacent seas, including the coasts of Europe and Africa ... and also the opposite coast of America ... the determinations of the longitude as given by the marine clocks of Mr. Ferdinand Berthoud in the voyage performed by order of the Government of France in 1768 and 1769, in the ship Isis, London: for Robert Sayer & John Bennett, 1777, large hand-coloured engraved map on 4 engraved sheets mounted as one, central compass point, overall dimensions 1,070 x 1,410mm., framed and glazed.