132 THE PRINCIPLES OF MYODYNAMICS. 



tions of the triceps rotator and the inrotating 

 part of the gluteus minimus by measuring a 

 given case : — 



(i.) From the insertion of the gluteus mini- 

 mus to the insertion of the triceps rotator, the 

 distance was one inch. 



(2.) From the insertion of the triceps rotator 

 to the head of the femur, the distance was two 

 and one-half inches. 



(3.) And from the insertion of the gluteus 

 minimus to the head of the femur the distance 

 was three and one -half inches. 



129. Let the rotating component of the tri- 

 ceps rotator be the power, the rotating compon- 

 ent of the ehiteus minimus be the weio^ht, and 

 the pressure on the head of the femur be the 

 fulcrum : — The lever will be of the third order : 

 Let the fulcrum be fifty pounds. 



Then: P = W + 5o . . . (i.) 

 And: W = Ix F = i25 . . (2.) 

 Hence P = 175 . . . . (3.) 



130. These figures show : — 



(i.) The rotating component of the gluteus - 



