THE PRINCIPLES OF MYODYNAMICS. 



39 



angle varies, the magnitudes of the rectangular 

 components will vary : — and the laws of varia- 

 tion in the magnitudes of the rectangular com 

 ponents will be the same as those of a bony lever 

 of the first, or second order : — See 22, (i), (2), 

 (3). (4). 



26. B. In Figs. 11, 12 and 13, on the long 

 axis of the contracting muscle construct the 

 parallelogram o s i c which shall correspond to 

 and be twice as great as the myodynamic tri- 

 ancrle : — 



(1.) In Fig. II, the whole force of the con- 

 tracting muscle appears in the rectangular com- 

 ponents. 



(2.) In Fig. 12, the whole force of the con- 

 tracting muscle appears in the moving compo- 

 nent. 



(3.) In Fig. 13, die whole force of the con- 

 tracting muscle appears in the rectangular com- 

 ponents. 



26. C. Rules for finding the rectangular com- 

 ponents of a contracting muscle : — 



(a) Drazu a line from the origin of the contract- 

 ing muscle at right aiigles to and ineeting the loitg 



