Electrical Axis of the 



Human Heart. 



63 



MM 

 140 



120 



100 



80 



60 



40 



20 



1-7 -t" 



-20 



-4-0 



-60. 



V87 



-5 



-27 



20^ 



o 

 > 



o 

 o 

 o 



Fig. 9. — Curves con- 

 structed in a similar 

 manner as those 

 given in fig. 6, to 

 show the slight differ- 

 ences of the electro- 

 motive value of the 

 spike Vi in the in- 

 ferior transverse lead 

 and in the two right 

 inferior leads (axial 

 and right lateral) and 

 in the two left in- 

 ferior leads (equa- 

 torial and left lateral). 

 The numbers along 

 the curves in this 

 fig. as in fig. 6 express 

 l/100000ths of a volt, 

 e.g., 108 signifies 

 0-00108 volt. 



-45 



-55 



40< 



60 Q 



80 c 



