Hollow Acrylic Semi-Circle for Refraction Index Study, 3 x 1.5 x 1.75" Subject_Anatomy packaged in a hard plastic

packaged in a hard plastic case with standard-size pieces

3125 inch thickness

this 80mm steel needle in a 6mm rod doubles as a precise alignment reference for image-formation and ray-tracing setups

and gas control on natural gas for high-temperature chemistry heating applications

2A rheostat with oxidized constantan winding on a 300x44mm vitreous-enameled tube

Hollow Acrylic Semi-Circle for Refraction Index Study, 3 x 1.5 x 1.75" Subject_Anatomy packaged in a hard plasticAcrylic semi circular block measuring 3 x 1. 5 x 1. 75 inches with a center indicator line, used to study Snell's law, total internal reflection, and critical angle behavior.