ANIMAL MECHANICS. 463 



Mr. JYiphers Experiments — {Raising Weights at given rate) 





« (right arm). 



n (left arm). 



i kii. 



255 



213 



2 „ 



97 



75 



3 » 



6i 



5o 



4 „ 



37-7 



3i-7 



5 » 



2 9- 3 



24.7 



6 



21-5 



17.8 



7 » 



15-8 



12.8 



8 „ 



12.8 



9-5 



In this case, the work done involves the raising of the 

 arm as well as the raising of the weight ; let a represent the 

 weight of the arm, then we have, supposing the arm to be an 

 uniform cylinder, 



Total work done = (^iv + ^ hn 9 



Kate of work 



9* 



Hence, by the Law of Fatigue, 

 w + - J h 2 n 



constant, 



or, since h and t are constant, 



n = 



A. 



(i33) 



This, as before, represents a cubical hyperbola similar to 

 equation (130). 



1 find, by trial, the following values of the constants :— - 



Right arm. Left arm. 



A = 1000 A = 850 



a = 2.0 a = 2.2 



