Abstract
As we go to press, the following communication signed by Prof. W. J. de Haas and E. C. Wiersma of Leyden, and Prof. H. A. Kramers, of Utrecht, and dated May 15, has been received: “Debije has indicated a method of reaching very low temperatures by means of the adiabatic demagnetisation of paramagnetic salts. We have applied this method to CeF3 with complete success. We determined a susceptibility curve in the region of temperatures usually reached with liquid helium, and by extrapolation from this curve in such a way that the result can only be too high, we found that the temperature reached in the adiabatic experiment was certainly below 0.27°K., even when the saturation was not taken into account. The other method of lowering the temperature, by reducing the vapour pressure of liquid helium, has resulted in a temperature of 0.82°K. reached by Kamerlingh Onnes, and later in one of 0.71, reached by Keesom.”
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