276 TABLES 307,308. 



SPECIFIC RESISTANCE OF METALS. 



TABLE 307 (concluded). 



The resistance is here given as the resistance in microhms per cm. cube when the specific 

 sistance of mercury at o C. is taken as 04.1 microhms. 



resistance of mercury at 



TABLE 308. Temperature Resistance Coefficients. 



If R is the resistance at the temperature t , and Rt at the temperature t, then Rt may over small 

 ranges of temperature be approximately represented by the formula R t = R ( i + at). 



SMITHSONIAN TABLES. 



Mercury, R = R (i + .000891 +0000011*). 



