The surface of a sodium specimen was examined under high magnification while it was at a temperature near that of liquid helium. For this purpose a small portable cryostat was designed which would fit under the objective of an ordinary standard microscope. The observations show that at 20 K about 45% of the sodium has undergone martensitic transformation. (W.D.M.)
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Hüll et al. (1959) studied this question.
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