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[en] Paramagnetic resonance, which has given interesting information on several structures, can be used for studying coal-like materials. Using a microwave spectrometer (9,000 Mc./s.) for electronic paramagnetic resonance, we have observed a characteristic line for coals. This sharp line is associated with a Lande factor of 2, which is the free electron value. These results lead us to believe that this paramagnetism is linked with the structure of coal-like materials and cannot be attributed to the minerals always present, such as iron. In the present communication we give further details on the results observed for coals and for several coal-like materials in which paramagnetic resonance has been detected. Reprint of a paper published in 'Nature', Vol. 174, 25 September 1954, p. 614
[en] By integrating the technical chronology with the philosophies underlying construction of the Saclay reactor, the director of the project paints the best available picture of the French advance towards nuclear power. Reprint of a paper published in Nucleonics, Vol. 12, No. 8, August 1954, p. 8-11.