CHT237254 Bell jars used to study atmospheric nitrogen under the influence of electricity at the Station Marcellin Bertholet, Meudon, from a book on 400 years of the College de France, published in 1930 (b/w photo) by French Photographer, (20th century); Bibliotheque du College de France, Paris, France; (add.info.: cloches et pots utilises pour l\'etude de la fixation de l\'azote atmospherique sous l\'influence de l\'electricite a faible tension;); 穢 Archives Charmet; French, out of copyright.