The hangar at rue Lhomond
Exterior of the ‘hangar’ of the Ecole de Physique et de Chimie de la Ville de Paris, then at 42 rue Lhomond, where Pierre and Marie Curie first isolated polonium and radium from a uranium ore known as pitchblende. Almost 400 tonnes of pitchblende had to be processed for one gram of uranium to be produced.