THE PRINCIPLES OF MYODYNAMICS. 3 1 



the magnitudes of the rectangular components 

 may be enunciated. 



(i.) The displacing component (i d) of the 

 contracting muscle will be a maximum, when 

 the myodynamic angle is least, and will con- 

 stantly diminish till the myodynamic angle is 

 right, — when there will be no displacing com- 

 ponent. 



(2.) The displacing component (i d) of the 

 contracting muscle will constantly increase from 

 the zero-point — -where the myodynamic angle is 

 right — till the myodynamic angle is greatest. 



(3.) The moving — or rete^itive — component 

 (o d) of the contracting muscle will be a mini- 

 mum, when the myodynamic angle is least, and 

 will constantly increase till the myodynamic 

 anofle is ri^ht, when it will be a maximum. 



(4.) The moving, or retentive component (o d) 

 of the contracting muscle will constantly dimiin- 

 ish from the maximum point — where the myody- 

 namic angle is right — till the myodynamic angle 

 is greatest. 



22. B. In Figs. 5, 6, and 7, on the long 

 axis of the contracting muscle construct the 



