14 THE PRINCIPLES OF MYODYNAMICS. 



And since the expression 2 g is a constant, it 

 may be rejected in comparing the energy of the 

 moving forces : 



The energ} of F: :FxV^ . , (4.) 



The energ)' of W: :WxY^ , . (5.) 



The energy of P::PxV^ . . (6.) 



The fulcrum is at rest and has no relative 

 motion : The power and weight describe circles, 

 whose radii are the power-arm and the weight- 

 arm of the lever : Hence, the velocity of the 

 power is proportional to the length of the power- 

 arm, and the velocity of the weight is propor- 

 tional to the length of the weight-arm of the 

 lever. 



Example : — Let the power-arm of the radial 

 lever be 2 inches, the biceps brachii being the 

 power ; and let the weight-arm of the radial 

 lever be 10 inches, the weight being 5 pounds : 

 Then the power will be 25 pounds. Now sup- 

 pose the power, in so far as it can balance the 

 w^eight, be a tangible body : Then we shall 

 have : 



The energ}' of P: : 2 5x2^=100 . (7.) 

 The energy of W: :5xio^r=5oo . (8.) 



