ANIMAL MECHANICS. 



365 



bisection of the middle fibre from the point 0: let this dis- 

 tance be represented by K, and we have, 



and the centre of the M 

 conic is found from 

 the equation 



2-Lx + M = o, 



which becomes 



2 (.17 + 7T) = o, 



and shows that the 

 axis of maximum work 

 is the axis which bi- 

 sects the middle fibre. 



In Fig. 92, AB 

 is the origin, and A'B' 

 the insertion of the 

 muscle, and LM re- 

 presents the calcu- 

 lated axis, and ST, 

 passing through the 

 socket S, the actual 



axis of rotation. |/ 0 



Fig. 93- 



Distance between calculated and observed axes = 0.40 in. 



