Manchester Memoirs, Vol xlviii. (1904), No. 1. 9 



STRESS LfMITS (TONSa) 



Pk- 5- 



This is illustrated by Fig. 5 which shows the results 

 of some of Wohler's experiments. Wohler in his con- 

 clusions drawn from his experiments stated that the 

 number of repetitions required to produce fracture 

 depended only on the magnitude of the stress range, and 

 not at all on the positions of the limits of stress ; that is 

 to say it did not matter whether the stresses ranged 

 between o and 10 tons or 10 and 20 tons. According to 

 our theory the latter should indeed be much weaker than 

 the former. Moreover, Wohler's own results as given by 

 Unwin are directly in opposition to his conclusion. Table 1 1. 



