﻿186 



Mr. F. Lloyd Hopwood on the 



progressive yielding of the specimen referred to in Table I. 

 the curves being plotted from measurements made on the 

 photographs. 



Taking the origin at the edge of the clamp and the hori- 

 zontal and vertical directions as the axes of x and y respec- 

 tively, it is found, on plotting the measurements from any 

 single photograph, that log x and log y are linear over a 

 considerable range, that is x and y are connected by a relation 

 of the form 



x=ay n (A) 



In fig. 3, log x and log y are plotted for the whole rod for 

 several photographs of the same specimen. 



Fig. 3. 



1-5 



t 





v r 



■ 

 / B 



/o 























A = Photo. N° 1 

 B= « «3 



C= « « 7 



D= <« « 9 

 E = « « xi 



+Loy.X 



1-5 



It is interesting to note that the divergences from linearity 

 which are shown by points remote from the clamp in the 



