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This paper deals with the measurement of stress or load in three structures using photoelastic gauges. Principals of photoelastic gauging are described with reference to the design and installation of a photoelastic stressmeter and gauges to measure earth pressure and steel cable tensions. Applications are described as follows: The measurement of load distribution between a concrete raft and piles using photoelastic stressmeters and photoelastic earth pressure gauges. The measurement of stresses in a prestressed box cantilever bridge using photoelastic stressmeters. The control of tension in the main supporting cables of a large suspension bridge using photoelastic load gauges.