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Postcard showing the Four Solaire of Odeillo, the world's largest solar furnace, located at 1800 m altitude in the Pyrenees. The printed text specifies its power of 1.000 kW, maximum temperature of 4.000 °C and its 54 m parabolic mirror. On the reverse, the publisher Paul Gaudin, the indication 'Printed in France' and a copyright notice are found.