i58 



THE PRINCIPLES OF MYODYNAMICS. 



weight, plus the indicated figures on the dyna- 

 mometer P, will equal the indicated figures on 

 the dynamometer F : The dynamic angle will 

 be acute, and the weight will have a resisting 

 and a displacing component ; the displacing 

 component will be put on the joint-surface by 

 the articular ligaments ; the resultant of the 

 resisting and displacing components — that is, 

 the force of the weight — will appear as stress on 

 the joint-surfaces. 



(4.) Make the myodynamic angle obhise, and 

 it will be found, by the myometer, that Ihe 

 weight, plus the indicated figures on the dyna- 

 mometer P, will equal the indicated figures on 

 the dynamometer F. 



141. Since the principle of the three orders 

 of the lever is the same, it must follow that the 

 conclusions, in regard to the resultants of the 

 components of the power and weight acting on 

 a bony lever as above enunciated in regard to 

 the lever of the first order, are also true rela- 

 tively in regard to the resultants of the com- 

 ponents of the power and weight acting on a 

 bony lever of the second or third order — that is, 



