Engineering, Physics
Photoelasticity Accessory
Set of two crossed polarizing sheets which display stress lines as beams as submit to three-point bending tests.
See stress lines by bending a clear, colorless photoelastic I-beam between two polarizing sheets. As the beam is bent, areas of greater stress show up as patterns of colored lines.
https://www.pasco.com/products/lab-apparatus/mechanics/materials-testing/me-8241#specs-panel