264 



TABLE 272. 



RESISTANCE OF METALS AND 



The electrical resistance of some pure metals and of some alloys have been determined by Dewar and Fleming and 

 increases as the temperature is lowered. The resistance seems to approach zero for the pure metals, but not for 

 temperature tried. The following table gives the results of Dewar and Fleming.* 



When the temperature is raised above o C. the coefficient decreases for the pure metals, as is shown by the experi- 

 experiments to be approximately true, namely, that the resistance of any pure metal is proportional to its absolute 

 is greater the lower the temperature, because the total resistance is smaller. This rule, however, does not even 

 zero Centigrade, as is shown in the tables of resistance of alloys. (Cf. Table 262.) 



* " Phil. Mag." vol. 34, 1892. 



t This is given by Dewar and Fleming as 13777 for 96.4, which appears from the other measurements too high. 

 SMITHSONIAN TABLES. 



