Semicircular Glass Block, 90 x 18mm Subject_Geology Copper plate with 4mm socket

Copper plate with 4mm socket terminals for the simple-cell apparatus

lighting an LED at the 4mm sockets

setting UV sanitization cycle duration and restoring full cabinet function when the original switch fails under classroom use

the f/4 curvature stretching the focal throw for projection-style image formation and reflector telescope analogues

and plano-concave geometries for safer student-station optics

Semicircular Glass Block, 90 x 18mm Subject_Geology Copper plate with 4mm socketGlass semicircular block at 90 by 18mm, the slim half disc geometry letting beams enter the curved face along its radius for clean refraction angle and TIR observations.