A series of three-dimensional photoelastic models (thickness to diameter ratio 0.009–0.016) have been tested and analysed with the objective of providing detailed experimental stress distributions for examples of this important configuration. Typical results are presented and discussed. The effects of varying the vessel length to diameter ratio, the support spacing to vessel length ratio, and the wall thickness to diameter ratio are examined; the effects of radiusing the edges and horns of the saddle are also studied.
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