﻿to Illustrate Elastic Hysteresis. 523 



in the diagram is MJ. After F has begun to increase, the 

 F — x relationship will correspond to the straight line JiK L , 

 whose slope is given by dF/d# = Ai + 2\ 2 . It will readily be 

 seen that the steady loop ultimately described will be a 

 parallelogram like JxKjL^! of figs. 6 or 6 a, the .slopes 



Fig. 6. 



FiR-. 6o. 



of whose sides have been indicated, but the corners of 

 which have to be found. Referring to the model shown 

 in fig. 3, it will be understood that in describing the loop, 

 the slip y will change in one direction and the other alter- 

 nately. When slip is occurring with increase of F, the 



