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Thus the values of the coefficient of viscosity of different 

 metals range from 1*65 x 10 8 to 25'5 x 10 8 , except in the 

 case of fusible metals, where the coefficients are several ten 

 times greater than the above values. The above values for 

 copper are much greater, but that for nickel much less, than 

 those obtained by Voigh 



We shall next explain why the coefficients of viscosity 

 must have so large a value as those given above. Referrino- 

 to the equation of motion for the torsional oscillation, if the 



