of Iron and German Silver, 497 



Even periods. 



w, = 99-96 U = 5-47 K = 15-09 

 ^0= 4-71 V,„= 33-22 H= 000266 



w, = 99-96 U = 5-54 K = 15-29 

 Uq== 4-71 V^=33-16 H= 000271 



w, = 99-96 U = 5-59 K = 15-10 

 Wo= 4-52 V^ = 33-32 H= 0-00264 



w, = 99'96 U = 5-69 K = 15-16 

 Wo= 4-52 V^=33-49 H= 0-00262 



Odd periods. 



Mi = 99-96 U = 5-97 K = 14-39 

 Uq= 4-52 V^= 33-03 H= 000261 



w^ = 99-96 U = 6-00 K= 14-40 

 Uq= 4-52 V^= 33-01 H= 00026] 



w, = 99-96 U = 604 K = 14-68 

 Uq= 4-54 V^ = 32-99 H= 0-00267 



w^ = 99-96 U = 6-10 K= 14-76 

 Uq= 4-62 V^=32-86 H= 000273 



If we take the mean of the values of K and H given by the 

 even periods, and likewise of those derived from the odd periods, 

 we obtain : — 



K = 15-14, H = 0-00266; 



K = 14-56, H = 000266. 



The difference which appears here between the values result- 

 ing from the even periods and those resulting from the odd 

 ones is to be accounted for by a want of absolute coincidence of 

 the soldering-places with the points x=i\l and x = ^l', for a 

 small deviation of the first-mentioned place may have a consi- 

 derable influence. The mean of the whole is : — 



K=14-85, H = 000266. 



As both K and H are variable with the temperature, we must, 

 in order as far as possible to apply calculation to the variability, 

 refer these values to the mean temperature of the rod. Deno- 

 ting this by A, we find 



Phil. Mag. S. 4. No.'296. "^Suppl. Vol. 44. 3 K 



