Polariscope and Photoelasticity by the University of Illinois Mechanical Testing Instructional Laboratory

Primary apparatus description: mtil.illinois.edu/equipment/pola . Describes specimen loading by manual leadscrew, load-cell readout, monochromatic illumination, polarizer/analyzer and camera. The direction and magnitude settings distinguish isoclinic and isochromatic observations. The source documents an instructional apparatus, not a universal inversion method.