( 213 ) 



of the silver wire (resistance at (T) changes slightly by being drawn 

 out in consequence of the difference in expansion of silver and glass. 

 The preceding table gives the resistance expressed in that at 0° as 

 unity. (The resistance at 0° was 21.519 i2). 



Column — Cd contains the deviations from a formula adjusted 

 from + 100° to — 259° of the new form : 





= 1 + a . 10-2 .t + b 10- 4 «2 + c 10-6 t 3 



/10 9 10" 



+ </ 



\T> (273.09) 

 which agreed best with the values : 



;) + «(^ 



10 10 

 (273.09)' 



(D) 



For a comparison with platinum and gold the column — Ca 1v 



gives the deviations from a formula of the form A (see Comm. 

 N°. 95' and 95 J ): 



W, /10 s 10' \ 



_< = i + «oio- + w.io- + ct'.io- + d {—— ^^J 



with values 'which we distinguish by Ajv on account of the other 

 way of adjusting the coefficients. 



$ 5. Bismuth. The measured resistance, which we shall also 

 investigate in the magnetic field, was that of a bismuth spiral of 

 Hartman and Bracn N°. 301. The resistance expressed in that at 

 0° as unity (the resistance at 0° was 17.3138 Ö) was: 



