THE PRINCIPLES OF MYODYNAMICS. 



57 



angled at the joint, the weight may equal the 

 displacing component of the contracting muscle. 

 The sides of the myodynamic triangle may be 

 measured, and then it is easy to find the mov- 

 ing component as well as the entire force of the 

 contracting muscle. 



Example. — Let W==:5o : The displacing com- 

 ponent of the contracting muscle=5o. Let the 

 sides of the component triangle be 2, 10, and 

 10.19 respectively: Then by the formulae (3) 

 and (5) 27 (b.) 



10 



m-c=5o X =25o : 



2 



10.19 



And f-m=5ox =254.75. 



2 



In which m-c is the moving component and 

 f-m the entire force of the contracting muscle. 



(A.) It is evident that the displacing com- 

 ponent of the power is antagonized by the 

 articular ligaments that connect the movable 

 and the fixed bones : Hence the displacing 

 component of the power is combined with the 

 moving component of the power and presses 



