by twisting Magnetized Iron and Nickel Wires. 125 



C.GLS. units (July 5, 1888). The following Table gives the 

 readings of the first swing in different magnetizing fields : — 



Nickel wire (r = *5 millim., I = 30centim., t = + 60°). 

 Unloaded. 





! 

 Reading of 





Reading of 



£■ 



ballistic 



&• 



ballistic 





galvanometer. 





galvanometer. 



•21 



7 



13-8 



149 



•34 



15 



19-9 



151 



•71 



26 



31-7 



152 



1-14 



45 



40-7 



149 



2-01 



85 



48-8 



145 



3-63 



107 



61-0 



142 



4-74 



122 



75-6 



136 



6-82 



135 



1100 



124 



905 



144 







The result is shown graphically in Plate II. fig. 1. Ex- 

 amining the curve we see that the current increases rapidly 

 in low magnetizing fields ; but as the magnetizing force be- 

 comes greater the increase takes place very slowly, passes a 

 maximum, and begins to diminish nearly in a straight line. 



On loading the wire and going through the same series of 

 operations, the following readings of the deflexion were 

 taken : — 



Nickel wire (r = '5 millim., I 

 Loaded 3 kgs. 



30 centim., t = + 60°). 

 Loaded 6 kgs. 





Reading of 



€>■ 



ballistic 





galvanometer. 



•71 



3 



10 



8 



3-6 



30 



6-8 



64 



100 



98 



19-9 



140 



31-8 



154 



410 



159 



49-1 



161 



60-6 



160 



83-0 



158 





Reading of 



$. 



ballistic 





galvanometer. 



11 



7 



3-6 



16 



74 



35 



16-8 



87 



24-1 



129 



31-8 



146 



40 7 



155 



51-0 



165 



68-7 



168 



85-8 



167 



The above readings are plotted in fig. 1, from which we 

 see that although the essential form of the curve is not 



