LSE4403240 Two polytechnicians in front of the school in the 19th century - watercolour drawing by Rene Louis, Musee Carnavalet, 19th century? by Louis, Rene (19th century); Musee de la Ville de Paris, Musee Carnavalet, Paris, France; (add.info.: Two polytechnicians in front of the school in the 19th century - watercolour drawing by Rene Louis, Musee Carnavalet, 19th century?); Photo by Leonard de Selva.