710 



The last column shows that for the greater deviations, not less 

 than 7 mm, the curve agrees satislactorily with theory, v 



being sufficiently constant. If we pass on to smaller ordinates this 

 quantity seems to decrease very rajiidly. U must be remarked iiow- 

 ever tliat the small ordinates cannot be measured with sufficient 

 precision. We shall therefore use the first four ordinates only. Tiie 

 mean of the numbers deduced from them is 



r 1/ =0,124. 



V I b' 



Further it follows from the curve that 



1,85 



The moment of inertia of the vibrating system was determined 

 by measuring the change of frequency produced by the addition of 

 a small moment of inertia, which is accurately known. 



We found ^) for it 



Q = 0,0126 



If now we take 1300 for the magnetization (calculated from the 

 hysteresis curve of the material and the constants of the coil) we 

 find for the magnetic moment of the cylinder 



I, = 470. 



With these numbers equation (17) leads to the value 



1) It may be mentioned here that, assuming a pure cylindrical form, we calcu- 

 lated for the moment of inertia of the cylinder without the glass tube and the 

 little minor () = 0,0102. 



