In the most general case the determination of the separate stresses along a selected line in a three-dimensional photoelastic model requires the evaluation of the shear slopes in two mutually perpendicular planes which intersect in the chosen line. The measurement of one normal and two oblique observations at a series of corresponding points in a set of parallel slices provides an alternative method for determining the shear slopes and yields a complete analysis of the stress distribution without further optical measurements. The method is illustrated by its use to analyse the stresses in a model of a loaded rail supported upon a deep welded plate girder.
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