Manchester Memoirs, Vol. /z/. (1911), No. \% 21 



paper is fixed ; the movement of this table is directly pro- 

 portional to the load as it is attached to the spring ' H ' by 

 means of the thread ' W.' The movement of the table is 

 controlled by the counter-weight ' X.' 



Fig. 1 1 shows a reproduction of an actual diagram, 



Exbension 



Fig. II. 



Reproduction of Actual Diagram showing Constaficy of Results obtained with the Hysleresis 

 Machine. 



Test-pieces cut from 2,500 megohm cable covering, and put through three cycles of extension 

 and retraction. 



Curves a^, a.,, a^ are made up of four lines, each due to a separate test-piece. 



Curvesyi,y.,, /s due to a single test-piece cut from the same cable covering as the others, but 

 containing a longitudinal joint. 



showing the constanc)' of the results obtained with the 

 hysteresis machine. 



The following laws are deduced from the results 

 obtained with this machine : — 



