South Wales, established in 1788, the British government set its western boundary at the meridian of 135° East of Greenwich, as it appeared on Thévenot's chart. Thévenot is often confused with his nephew, the traveller Jean de Thévenot. There is evidence to suggest that both Huygens and Hooke later laid claim to the invention of the spirit level, although only within their own countries. There is no surviving portrait of Thévenot, and an alleged portrait of him (such as can be seen in Gerrit Lindeboom's edition of Thévenot's letters to Swammerdam) is actually of his nephew Jean. Notes References Robert A. Hatch, The Scientific Revolution, Westfall Catalogue, Scientific Community (contains bibliography of sources on Thévenot)Camus, Armand-Gaston. Mémoire sur la Collection des grands et petits voyages [des de Bry] et sur la collection des voyages de Melchisedech Thévenot''. (Paris: Baudouin, 1802). 1620s births 1692 deaths 17th-century French scientists French science writers 17th-century French inventors French cartographers Members of the French Academy of Sciences French male non-fiction writers