ACD169033 Measuring the Meridian, illustration from \'La Meridienne de Paris\' by Cesar-Francois Cassini de Thury, 1744 (engraving) (b/w photo) by French School, (18th century); Academie des Sciences, Paris, France; (add.info.: member of the famous Cassini family of astronomers who carried out the mapping and revision of the Paris meridian over several generations;); 穢 Archives de l\'Academie des Sciences ; 穢 Archives Charmet; French, out of copyright.