Review of analysis of stress and strain - basic equations of elasticity. Introduction to ideal requirements of strain measuring devices - mechanical, optical and electrical strain gauges Electrical Resistance Strain Gauges - Gauge Factor, Types, Gauge materials, Backing Materials, Adhesives, Protective Coatings, Bonding of Strain Gauges, Lead wires and connections, Semiconductor strain gauges Performance of Strain Gauges - Temperature compensation, Transverse sensitivity, Gauge Length, Response, Excitation level, Stability. Strain Gauge Circuits and recording instruments, Strain Gauge Rossetes analysis, Stress Gauge. Photoelasticity methods - behavior of light, plane polarized and circular polariscope, isochromatic and isoclinic fringe patterns for two-dimensional photoelasticity, three-dimensional photoelasticity, model slicing and shear difference method, birefringent coating method. Introduction to brittle coating method and Moire Fringe technique. Prereq: ME 223. Dual-listing: ME 671.