Beown — Mechanical Stress and Magnetisation of Nickel. 45 



magnetic field of 24 units, which field is increased to about 30 units with au 

 initial amplitude of 70°, and furtlier increased to about 35 units when the 

 amplitude at starting is 50°. 



The ordinates in fig. 3 are drawn to a much larger scale tlian those in 

 fig. 6, and the hollows of the corresponding curve or tlie position of greatest 

 damping in fig. 3 took place when a magnetic field of 35 units was round the 



80 



70 



60 



g § 50 



s 



40 



•S .^ 



^■^ 7>0 



1 20 



to 



\ / 



90" 



70 



50° 



30° 



ZQ 



40 



60 



Fig. 6. — Longitudinal Magnetic Field. 



wire. Though this latter wire was of larger diameter than the one used to 

 get the results shown in fig. 6, the results are the same, as we know that for 

 the same longitudinal load per unit cross- sectional area, the magnetic field in 

 which the greatest internal friction takes place is independent of the diameter 

 of the wire. 



