26 Mr Molin, An examination of Searle's method 



of observation, there was no observable acceleration. AVe may 

 conclude that, even for the greatest values of M, the viscosity of 

 the liquid remained sensibly constant, in spite of the fact that 

 some potential energy was converted into heat. 



The values of T found in these experiments are given in 

 Table 1. 



Table 1. 



Time, in seconds, of one revolution of cylinder. 



The results have been plotted in the form of six curves each 

 for one value of I, as in Diagram 1. The curves are represented in 

 the form T {MT, M )^.eonst. = 0. 



From the diagram it is clear that the function T {MT, T)i = 

 does not represent a family of straight lines parallel to the ilf-axis, 

 and that each of the six curves has a hyperbolic appearance. When 

 M approaches a certain lower limit Mq, MT tends to infinity. 

 The area covered by the group of curves can be divided by a 

 parabolic boundary curve into two departments, in one of which 

 MT is sensibly constant for a given value of I. 



§ 4. I have, further, examined how MT depends upon I, when 

 M is kept constant, and have found that the function 



F {MT, Z)^,=eonst. = 



