﻿4 Prof. L. N. G. Filon : Investigation of Stresses 



which were screwed into a table GH. A central load was 

 applied by placing weights upon a hanger P suspended from 

 a knife-edge which rested on the upper surface of the bar. 



In addition, a nexural couple, free from shear, could be 

 applied to the bar by suspending weights symmetrically 

 from light wooden arms AQ, BR, which were clamped to 

 the extremities of the bar as shown in fig. 1, and projected 

 several feet beyond the supporting knife-edges. An arrange- 

 ment of levers and wires (shown in Plate I.) allowed such a 

 couple to be applied in either sense. 



