Double Concave Glass Lens, 50mm Diameter, 100mm Focal Length, 16.5mm Thick Subcategory_Alternative Energy Nylon ball-bearing adjustable clamp pulley

Nylon ball-bearing adjustable clamp pulley supporting low-friction rotation across varied rod-and-stand mounts

expanding and closing to suit different optical-component sizes on a single bench-mounted holder

this single-phase rheostat carries oxidized constantan winding with 4mm safety socket terminals

One-amp DC scale on a 315x115mm laminated panel with sealed shunt

Double Concave Glass Lens, 50mm Diameter, 100mm Focal Length, 16.5mm Thick Subcategory_Alternative Energy Nylon ball-bearing adjustable clamp pulleyDouble concave glass lens at 50mm diameter and 100mm focal length, a thick 16. 5mm blank with optically true surfaces, the diverging curvature producing virtual upright images for refraction work.