2:;s 



PROCEEDINGS OF THE AMERICAN ACADEMY. 



where P is a power series in p, gave still better results. The form 

 finally adopted was, p = ap 10 6pC , where 



log a = 5.5242 -10, 

 log (-6) = 6.2486 - 10, 

 c =0.75. 



This form does not lend itself to computation by least squares, and the 

 best values for a, b, and c were found by trial. Table III shows the 



TABLE III. 



Comparison of Observed and Calculated Change of 

 Resistance with Pressure. 



