78 Messrs. J. W. Swan and J. llhodin. Absolute [May 24, 



Table III. 



Rocking Tank A Copper. Hard drawn. 

 Specific Resistance. 



Measurements with Rocking Tank A Copper, Soft. 



A similar wire to that used in the previous measurements was 

 annealed in a tube of hard glass, through which was passing a current 

 of dry CO 2 gas, in order to prevent oxidation. The following 

 measurements were made with it : 



Density at 15 C., 8'959 (see previous table). 

 Absolute weight of 300 cm. of the wire, 5'5746 grams. 

 Diameter. 



/5-5746 

 X = 2r = 2 A/ ^ 8-959 x 300 = 2 X ' 025694 = 0'051388 cm. 



