Requisites of Perfect Balance 113 



with ground. If, however, this leverage is aided by a number of in- 

 termediate points which in succession act as fulcrums with short lever- 

 age, the motion of points A and B will be quicker, and hence the shorter 

 will be the contact with ground. That is to say, the arc M N repre- 

 sents in reality the degree of rotation of the foot, and the slower the 



FIG. 86. 



leverage from heel to toe the less will be the rotation or elevation of 

 that foot; and the quicker the leverage from heel to toe, the greater 

 will be the rotation or elevation of that foot. This arc M N, or the 

 length of its radius, or the degree of its curves or rotation, depend 



therefore directly on the length of A B or rather the distance of A to 

 the nearest point coming in contact with ground after A. Therefore, 

 to quicken and elevate action and particularly to minimize leverage at 

 toe, the rolling motion shoe in its various forms will always remain a 

 sensible type of construction. 



