Abstract
This paper reviews, briefly, earlier scattered light photoelastic polariscopes and describes, in detail, a new design of this equipment for three‐dimensional stress analysis. The present polariscope makes use of recently developed experimental techniques which employ a polarizer to determine the directions of the secondary principal stresses and Sénarmont's principle of compensation for determining the fringe order. No compensator is required. Photographs of stress patterns are shown. The clearly defined fringes in these patterns demonstrate the high quality of the new polariscope.

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