540 



PROF. C. G. KNOTT ON 



with the total resistances of the branches, but with the resistances of the nickel within 

 the anchor rings. After the arrangement was taken to pieces the resistances of the 

 nickel wires without connections were carefully measured at a temperature of 13°"8 C. 

 with the following results : — 



Wire. 



Resistance. 



Entire Length. 



Length within 

 Anchor Ring. 



M, . . 



N,. . . 



2-355 

 2-361 



2-248 

 2-253 



From these and other data already referred to the resistances of the parts of the nickel 

 wires which were subjected to the magnetising forces could be calculated for the various 

 temperatures at which experiments were made. The results are given in the succeeding 

 table. To bring out the nature of the phenomena more clearly, definite values of 

 current at regular intervals are chosen, the corresponding changes of resistance being 

 taken from the curves obtained by plotting against each other the values in the second 

 and fifth columns of the preceding tables. 



The first column contains the value of the magnetising current ; and then follow six 

 columns of resistance changes, three for each wire, each headed by its appropriate 

 temperature and the resistance of the wire in the unmagnetised condition. This 

 temperature is the mean of the various temperatures in each set of experiments given 

 in the earlier tables. 



RESISTANCE CHANGES IN THE NICKEL WIRES M AND N. 





] 



Resistance of JV 







Resistance of Is 







At 12° -6. 



At 57°-5. 



At 93°-l. 



At 12" -9. 



At 57° '4. 



At 93° -9. 



Cuirent 



2-236 



2-715 



3-073 



2-244 



2-712 



3-083 



1-5 



+ •0174 



+ •0219 



+ •0245 



+ 0164 



+ •0215 



+ -0252 



1-4 



166 



207 



240 



155 



199 



236 



1-3 



157 



197 



229 



145 



187 



219 



1-2 



148 



186 



217 



135 



175 



206 



1-1 



138 



173 



205 



125 



162 



191 



10 



128 



160 



191 



113 



148 



175 



•9 



118 



147 



176 



102 



132 



159 



•8 



104 



185 



160 



895 



118 



141 



•7 



90 



118 



143 



775 



102 



123 



•6 



76 



100 



125 



637 



844 



102 



■5 



615 



805 



102 



500 



664 



828 



•4 



452 



584 



754 



360 



477 



606 



•3 



255 



358 



481 



217 



292 



373 



•25 



170 



241 



330 



150 



209 



245 



