160 



BRIDGMAN. 



tion within limits 100 kg. apart, at a mean pressure of 1990 kg. We 

 take as the most probable transition pressure at 0°, 1980 kg. At 17° 

 the transition was shut between two limits 400 kg. apart, mean 

 3260 kg. The transition curve is therefore of the normal type, rising 

 to higher temperatures at higher pressures, and the phase stable at 

 the higher temperature has the greater volume. Unless the transition 

 line has exceptionally great curvature, it should be possible to find the 



1.35 

 1.30 

 1.25 



1.20 



4) 

 U 



3 1 15 



0> 



1.10 



1.05 



1.00 



.95 



Pressure, Kg. / Cm 

 Caesium 



2 X 10 3 



Figure 3. Caesium. The resistance at 0° C. of the new high pressure 

 modification of caesium as a function of pressure in terms of its resistance at 

 0° C and 3000 kg/cm 2 as unity. 



new modification at atmospheric pressure at some temperature below 

 0°; linear extrapolation gives —26° as the atmospheric transition 

 temperature. 



The electrical properties of the high pressure modification were 

 found to be abnormal in that the resistance increases with increasing 

 pressure. This makes the sixth metal now known with this property, 

 the others being bismuth, antimony, calcium, lithium, and strontium. 



