= Polariscope and Photoelasticity by the University of Illinois Mechanical Testing Instructional Laboratory
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Primary apparatus description: https://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.
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