ELECTRICAL RESISTANCE UNDER PRESSURE. 



85 



values tabulated are relative values of the specific resistance, taking 

 as unity the resistance of the solid at atmospheric pressure at 0°. The 

 observed values have been corrected for the expansion and compressi- 



4 3 5 7 8 



Pressure, Kg. / Cm.'^ X 1 

 Potassium 



Figure 5. Relative resistances of potassium at several constant tempera- 

 tures as a function of pressure. 



bility of the glass, assuming for the linear expansion O.Os?, and for the 

 linear compressibility O.OeS. The corrections so introduced are much 

 smaller than usual, because of the \-ery large pressure and temperature 



