﻿538 Mr. W. A. Scoble on the Strength and Behaviour 



and twisting. Fortunately, tests of this kind could be made 

 with the limited apparatus at the disposal of the writer, and 

 they have the advantage that the distribution of tensile and 

 compressive stress is similar to that in the practical case, 

 whereas it is usual in tests under combined stresses to apply 

 the tension directly. 



8. The Apparatus and Specimens. 

 A general view of the apparatus is given in fig. 1. 



Fifr. 1. 



The 



bars tested were 36 inches long and turned to f-inch 

 diameter, with f-inch squares at each end. They were of 

 steel, all taken from the same batch, and two were prepared 

 from each length supplied. One end was held so that it 

 could not turn but was not constrained against bending. 

 The grip is given in fig. 2. The squared part of the rod fits 

 into a suitable slot and the cover-plate grips it. There are 



