THE PRINCIPLES OF MYODYNAMICS. 1 63 



osseous sides of the myodynamic triangle be 

 equal. And let the myodynamic angle equal 

 forty-five degrees, when the weight puts the 

 contracting muscle under strain. The dynam- 

 ometer P is fastened to the screw-eyes at L and 

 S, and the dynamometer VV is fastened to the 

 opposite screw-eye at S. Pull on the dyna- 

 mometer W till the angle S C L is a right angle, 

 and the indicator of the dynamometer P points 

 to the figure 17, then zuill the iiidicator of the 

 dyna7no77iete7' W point to the figures 12. Each 

 of the rectangular components will therefore be 

 twelve pounds. Hence, P will have a moving 

 component of twelve pounds, acting in the 

 direction W S. According to theory, the sum 

 of the squares of the two rectangular compon- 

 ents equals the square of the resultant. Hence, 



12^ -j- 12^ = I7^ 

 which is very nearly correct, the result being 



288 =^ 289. 



And this is near enough for theory to agree 

 with experiment. 



Second. Let a c equal one half L C, and let 

 the angle ac L equal a right angle, when the 



