Three techniques are considered here: brittle lacquer coating; strain gauge, and photoelasticity.
(1955), "SAE Golden Anniversary Summer Meeting: Summaries of the Papers Presented to the Meeting Held in Atlantic City, June 12–17, 1955", Aircraft Engineering and Aerospace Technology, Vol. 27 No. 10, pp. 346-347. https://doi.org/10.1108/eb032613
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