Abstract
Abstract Application of the photoelastic method of stress analysis to transparent bodies under plane stress permits direct observation of the two principal stresses σ1 and σ2 but determination of their values necessitates additional measurements or some form of graphical integration. In this paper the author develops the exact theory of the (σ1 + σ2)-network and a graphical method of applying it to the problem of stress measurement. By means of this method the isopachics can be accurately determined and these, together with the isochromatics and isoclinics, give the complete stress-field analysis from which the values and directions of the two principal stresses at any point may be readily obtained.
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