Straight Cone to Flexible Tubing Rotaflow Stopcock Adapter, 29/32 Cone, Borosilicate Glass Base Shape_Rectangular 230mm disc graduated 0-360 degrees

230mm disc graduated 0-360 degrees in 1-degree steps locks in any position alongside a rotatable lamp house and six magnetic acrylic elements for full ray-tracing studies of reflection and refraction

Glass double-concave lens at 50mm diameter and 100mm focal length

modeling the principle behind fiber optics

and a right-side zero reset

Straight Cone to Flexible Tubing Rotaflow Stopcock Adapter, 29/32 Cone, Borosilicate Glass Base Shape_Rectangular 230mm disc graduated 0-360 degreesStraight cone to flexible tubing Rotaflow stopcock in borosilicate glass provides controlled flow between ground joint apparatus and rubber tubing.