III.—A New Experimental Method of investigating Certain Systems of Stress

Summary

By experimental methods a close similarity has been shown to exist between certain simple stress systems and the corresponding systems of hydrodynamic flow. How nearly exact this similarity is, and how widely the application of the principle may be extended, are points which remain to be determined.

In a simply loaded bar there are secondary stresses which vary with the shape of the bar; the existence of these secondary stresses explains some apparent anomalies in the character of the lines of deformation.