62 Dr. A. D. Waller. Various Inclinations of the 



Values of V x in the Inferior Leads, taking into reckoning a Difference of 

 Potential between the two Feet. 





Left inferior. 



Eight inferior. 



T Ci. 



.Lett 

 longitudinal. 



Eight 

 longi- 

 tudinal. 



Interior 

 transverse. 



Left 

 lateral. 



Equatorial. 



Eight 

 lateral. 



Axial. 







100 



100 



100 



100 



150 



150 



o-o 



10 



91 



89 



106 



108 



149 



147 



1-7 



20 



79 



75 



109 



113 



143 



139 



3-4 



30 



64 



58 



109 



113 



132 



128 



5-0 



40 



48 



41 



105 



111 



118 



112 



6 -4 



50 



30 



22 



99 



106 



100 



93 



7-7 



60 



11 



2 



89 



98 



79 



71 



8-7 



70 



-8 



-18 



76 



86 



56 



47 



9-4 



80 



-27 



-37 



62 



72 



31 



21 



9-8 



90 



-45 



-55 



45 



55 



5 



-5 



10 -o 



I have repeated these two experiments many times and have rarely failed 

 to bring off either the first or the second upon the subjects who have 

 submitted themselves to one or other of the two. I have failed to effect 

 complete reversal in only one or two cases where the electrical axis was 

 above the horizontal or very nearly vertical. 



With a slight moditication the model given in fig. 5b serves to indicate 



the nature and amount of the slight differ- 

 ences observable between the two pairs of 

 inferior leads in consequence of the slight 

 differences of potential that are produced at 

 the two feet by the systolic spike V r The 

 potential-difference between the two feet in 

 what may be termed the inferior transverse 

 lead is in the same direction as that of the 

 hand-to-hand potential-difference, but of 

 much lower value. The inferior transverse 

 = 1/20 to 1/5 of the (superior) transverse ; 

 as an average for the purpose of calculation 

 it is taken here = 1/10, and represented on 

 the fig. 5b by the horizontal line rl 1 cm. 

 long across the point F. 



If now the positions of the two points 

 r, I (representing right and left foot), are 

 calculated for values of a from 0° to 90°— or pricked off on the model — 

 and plotted as before, the curves given in fig. 9 are obtained showing 



