CHT225143 Drawing of the lock at Negra on the Canal du Midi (w/c on paper) by Andreossy, Francois (1633-88); Service Historique de la Marine, Vincennes, France; (add.info.: l\'ecluse de Negre a Castelnaudary; Andreossy was an specialist in hydraulic engineering and assisted de Riquet in the construction of the Canal; Canal du Midi, linking the Atlantic to the Mediterranean, beginning at Toulouse and ending, after Agde, at the Etang de Thau; canal reliant l\'Atlantique a la Mediterranee; excavated by Pierre Paul de Riquet (1604-80) between 1666-81;); 穢 Archives Charmet; French, out of copyright.