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1—Many cases of plane stress distribution which are of importance to the engineer, present problems of mathematical analysis which are intractable and it becomes necessary to rely for a solution either on approximations, which are often crude, or on experimental methods. Perhaps the best known of these experimental methods is that of photoelastic analysis developed by Coker and Filon ; but this requires a wellequipped laboratory and considerable experience in technique if reliable results are to be obtained.

On an experimental method for the solution of plane stress problems